[xml] Predefined Entities Reference problem in SAX parsing

[Rabi Narayan Sahoo]

Hi 

  When I perform a sax parsing on the below xml file 

   <?xml version="1.0"?>

       <object DN="&amp;&lt;;DN;&gt;@&amp;#&lt;;Attribute;&gt;"
operation="modify">

       </object> 

In the startelementns callback for trigger element the value of the
attribute DN was $#38;<;DN;> @&#38;#<;Attribute;>

For all the predefined entities references it replace the corresponding
character but for amp it

replace again with a character reference.

As of XML1.0 specification "if a general entity reference appears in the
value of an attribute its replacement text MUST be processed in place of the
reference itself."

All the 5 predefined entities in XML are basically parsed general entities.
When I check the code I found that following piece of code in
xmlParseAttValueComplex () make the difference

ent = xmlParseEntityRef (ctxt);

if ((ent != NULL) &&

       (ent->etype == XML_INTERNAL_PREDEFINED_ENTITY)) {

       if (len > buf_size - 10) {

              growBuffer (buf, regmemhdl);

       }

       if ((ctxt->replaceEntities == 0) &&

              (ent->content[0] == '&')) {

              buf[len++] = '&';

              buf[len++] = '#';

              buf[len++] = '3';

              buf[len++] = '8';

              buf[len++] = ';';

       } else {

              buf [len++] = ent->content [0];

       }

For all other predefined entities apart from amp irrespective of the
ctxt->replaceEntities

the corresponding character is replaced. Similarly any internal general
entity reference occurring in the character content are also replaced

by their replacement text irrespective of the value of
ctxt->replaceEntities. Can anybody please describe why an amp entity
reference is handled in this manner in SAX?

Thanks and Regards

      Rabi


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