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plugin produces aXML code,
   parser takes that aXML code and produces HTML code,
      browser takes that HTML code and produces text.

parser takes aXML code,
...

browser takes finished resulting HTML and produces page

(aXMLplugin name="TD")"$_[0]",(/aXMLplugin)
...

(inc)path/to/htmldata(/inc)

...
...
...

(aXMLplugin name="greet")hello world(/aXMLplugin)

 greet => sub {"hello world"},

(aXMLplugin name="foo")"hello world"(/aXMLplugin)

   foo => sub {"\"hello world\""},

"hello world"