BACKGROUND: I'm using XML::Compile::Schema to read multiple xsd files and generate a hash of the contents with the template function.

my $xsd=XML::Compile::Schema->new(\@array);
my $t= $xsd->template('TREE',$xsd->elements());
print LOG Dumper($t);

[download]
The resulting LOG shows:

$VAR1 = {
          'attrs' => [],
          ...
          'elems' => [
                       bless( {
                                'struct' => [...],
                                'elems' => [
                                             {
                                               ...
                                             },
                                             {
                                               'attrs' => [],
                                               'elems' => [
                                                            bless( {
                                                                     '
+struct' => [...],
                                                                     '
+elems' => [
                                                                      
+            {
                                                                      
+              ...
                                                                      
+            },
                                                                      
+            {
                                                                      
+              'attrs' => [],
                                                                      
+              'elems' => [
                                                                      
+                           bless( {
                                                                      
+                                    'struct' => [
                                                                      
+                                                  ...
                                                                      
+                                                ],
                                                                      
+                                    'elems' => [
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [
                                                                      
+                                                                     
+                  ...,
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...                                                
+                                                                     
+    },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    ...,
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   'attrs' => [],
                                                                      
+                                                                     
+                   'elems' => [
                                                                      
+                                                                     
+                                bless( {
                                                                      
+                                                                     
+                                         'struct' => [...],
                                                                      
+                                                                     
+                                         'elems' => [
                                                                      
+                                                                     
+                                                      {...},
                                                                      
+                                                                     
+                                                      {...}
                                                                      
+                                                                     
+                                                    ],
                                                                      
+                                                                     
+                                         'tag' => 'sequence'
                                                                      
+                                                                     
+                                       }, 'BLOCK' )
                                                                      
+                                                                     
+                              ],
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [
                                                                      
+                                                                     
+                 ...
                                                                      
+                                                                     
+                ],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...                                                
+                                                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [
                                                                      
+                                                                     
+                  ...
                                                                      
+                                                                     
+                ],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 }
                                                                      
+                                               ],
                                                                      
+                                    'tag' => 'sequence'
                                                                      
+                                  }, 'BLOCK' )
                                                                      
+                         ],
                                                                      
+             ...
                                                                      
+            }
                                                                      
+          ],
                                                                     '
+tag' => 'sequence'
                                                                   }, 
+'BLOCK' )
                                                          ],
                                              ...
                                             },
                                             {
                                               'attrs' => [],
                                               'elems' => [
                                                            bless( {
                                                                     '
+struct' => [
                                                                      
+            ...
                                                                      
+           ],
                                                                     '
+elems' => [
                                                                      
+            {
                                                                      
+              'attrs' => [],
                                                                      
+              'elems' => [
                                                                      
+                           bless( {
                                                                      
+                                    'struct' => [
                                                                      
+                                                 ...
                                                                      
+                                                ],
                                                                      
+                                    'elems' => [
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [... ],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...                                               
+                                                                     
+ },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...
                                                                      
+                                                                     
+                 },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                  ...
               }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [...],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                ...                                                   
+                                                         },
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   'attrs' => [],
                                                                      
+                                                                     
+                   'elems' => [
                                                                      
+                                                                     
+                                bless( {
                                                                      
+                                                                     
+                                         'struct' => [...            
+                                                                     
+                                                          ],
                                                                      
+                                                                     
+                                         'elems' => [
                                                                      
+                                                                     
+                                                      {...},
                                                                      
+                                                                     
+                                                      {...},
                                                                      
+                                                                     
+                                                      {
                                                                      
+                                                                     
+                                                        ...          
+                                          },
                                                                      
+                                                                     
+                                                      {
                                                                      
+                                                                     
+                                                       ...           
+                                                                     
+                                              },
                                                                      
+                                                                     
+                                                      {
                                                                      
+                                                                     
+                                                        ...
                                                                      
+                                                                     
+                                                      }
                                                                      
+                                                                     
+                                                    ],
                                                                      
+                                                                     
+                                         'tag' => 'sequence'
                                                                      
+                                                                     
+                                       }, 'BLOCK' )
                                                                      
+                                                                     
+                              ],
                                                                      
+                                                                     
+                   ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [...],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   'attrs' => [],
                                                                      
+                                                                     
+                   'elems' => [
                                                                      
+                                                                     
+                                bless( {
                                                                      
+                                                                     
+                                         'struct' => [...],
                                                                      
+                                                                     
+                                         'elems' => [
                                                                      
+                                                                     
+                                                      { ...},
                                                                      
+                                                                     
+                                                      {...},
                                                                      
+                                                                     
+                                                      {...}
                                                                      
+                                                                     
+                                                    ],
                                                                      
+                                                                     
+                                         'tag' => 'sequence'
                                                                      
+                                                                     
+                                       }, 'BLOCK' )
                                                                      
+                                                                     
+                              ],
                                                                      
+                                                                     
+                  ...                                                
+                                                          }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 },
                                                                      
+                                                 {
                                                                      
+                                                   ...
                                                                      
+                                                 }
                                                                      
+                                               ],
                                                                      
+                                    'tag' => 'sequence'
                                                                      
+                                  }, 'BLOCK' )
                                                                      
+                         ],
                                                                      
+              ...
                                                                      
+            },
                                                                      
+            {
                                                                      
+              'attrs' => [],
                                                                      
+              'elems' => [
                                                                      
+                           bless( {
                                                                      
+                                    'struct' => [...],
                                                                      
+                                    'elems' => [
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...}
                                                                      
+                                               ],
                                                                      
+                                    'tag' => 'sequence'
                                                                      
+                                  }, 'BLOCK' )
                                                                      
+                         ],
                                                                      
+              ...
                                                                      
+            },
                                                                      
+            {
                                                                      
+              'attrs' => [],
                                                                      
+              'elems' => [
                                                                      
+                           bless( {
                                                                      
+                                    'struct' => [...],
                                                                      
+                                    'elems' => [
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {
                                                                      
+                                                   'attrs' => [],
                                                                      
+                                                   'elems' => [
                                                                      
+                                                                bless
+( {
                                                                      
+                                                                     
+    'struct' => [...],
                                                                      
+                                                                     
+    'elems' => [
                                                                      
+                                                                     
+                 {
                                                                      
+                                                                     
+                   'attrs' => [],
                                                                      
+                                                                     
+                   'elems' => [
                                                                      
+                                                                     
+                                bless( {
                                                                      
+                                                                     
+                                         'struct' => [...],
                                                                      
+                                                                     
+                                         'elems' => [
                                                                      
+                                                                     
+                                                      {...},
                                                                      
+                                                                     
+                                                      {...}
                                                                      
+                                                                     
+                                                    ],
                                                                      
+                                                                     
+                                         'tag' => 'sequence'
                                                                      
+                                                                     
+                                       }, 'BLOCK' )
                                                                      
+                                                                     
+                              ],
                                                                      
+                                                                     
+                  ...
                                                                      
+                                                                     
+                 }
                                                                      
+                                                                     
+               ],
                                                                      
+                                                                     
+    'tag' => 'sequence'
                                                                      
+                                                                     
+  }, 'BLOCK' )
                                                                      
+                                                              ],
                                                                      
+                                                  ...
                                                                      
+                                                 }
                                                                      
+                                               ],
                                                                      
+                                    'tag' => 'sequence'
                                                                      
+                                  }, 'BLOCK' )
                                                                      
+                         ],
                                                                      
+             ...
                                                                      
+            }
                                                                      
+          ],
                                                                     '
+tag' => 'sequence'
                                                                   }, 
+'BLOCK' )
                                                          ],
                                              ...
                                             },
                                             {
                                               'attrs' => [],
                                               'elems' => [
                                                            bless( {
                                                                     '
+struct' => [...],
                                                                     '
+elems' => [
                                                                      
+            {
                                                                      
+              'attrs' => [],
                                                                      
+              'elems' => [
                                                                      
+                           bless( {
                                                                      
+                                    'struct' => [...],
                                                                      
+                                    'elems' => [
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...},
                                                                      
+                                                 {...}
                                                                      
+                                               ],
                                                                      
+                                    'tag' => 'sequence'
                                                                      
+                                  }, 'BLOCK' )
                                                                      
+                         ],
                                                                      
+              ...
                                                                      
+            }
                                                                      
+          ],
                                                                     '
+tag' => 'sequence'
                                                                   }, 
+'BLOCK' )
                                                          ],
                                               ...
                                             }
                                           ],
                                'tag' => 'sequence'
                              }, 'BLOCK' )
                     ],
         ...
        };

[download]

QUESTION: I've never seen bless used in this context and definitely never nested like this. The concept of bless is still a little obscure to me. I guess I learn the best from example code. Since I haven't found any yet used in this way, I'm completely stumped as to why bless was used and what is the best way to access these elements? I'm able to drill down the structure just like it's a typical HOA, but why bless? I'm assuming bless is doing something special here, but I can't figure it out. Can someone shed some light for me?

UPDATED: original post was cut off for being too long. Abbreviated LOG output.

In reply to Nested Bless within Hash of Arrays by ksublondie

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