$h3 = {
	'drug comparison' => 
	{
          '7003000.xml' => {
                             'entity' => 'a1, a2, a3'
                           },
          '70037559.xml' => {
                              'entity' => 'x1, x2, x3'
                            },
          '7004562.xml' => {
                             'entity' => 'z1, z2, z3'
                           }
        }
};