nsISAXLexicalHandler Interface

 Report an XML comment anywhere in the document.

 This callback will be used for comments inside or outside the
 document element, including comments in the external DTD subset
 (if read).  Comments in the DTD must be properly nested inside
 start/endDTD and start/endEntity events (if used).

 @param chars The characters in the comment.

void comment(in AString chars)

 Report the end of a CDATA section.

void endCDATA()

 Report the end of DTD declarations.

 This method is intended to report the end of the
 DOCTYPE declaration; if the document has no DOCTYPE declaration,
 this method will not be invoked.

void endDTD()

 Report the end of an entity.

 @param name The name of the entity that is ending.

void endEntity(in AString name)

 Report the start of a CDATA section.

 The contents of the CDATA section will be reported through the
 regular characters event; this event is intended only to report
 the boundary.

void startCDATA()

 Report the start of DTD declarations, if any.

 This method is intended to report the beginning of the
 DOCTYPE declaration; if the document has no DOCTYPE declaration,
 this method will not be invoked.

 All declarations reported through DTDHandler or DeclHandler
 events must appear between the startDTD and endDTD events.
 Declarations are assumed to belong to the internal DTD subset
 unless they appear between startEntity and endEntity events.
 Comments and processing instructions from the DTD should also be
 reported between the startDTD and endDTD events, in their
 original order of (logical) occurrence; they are not required to
 appear in their correct locations relative to DTDHandler or
 DeclHandler events, however.

 Note that the start/endDTD events will appear within the
 start/endDocument events from ContentHandler and before the first
 startElement event.

 @param name The document type name.
 @param publicId The declared public identifier for the
        external DTD subset, or null if none was declared.
 @param systemId The declared system identifier for the
        external DTD subset, or null if none was declared.
        (Note that this is not resolved against the document
        base URI.)

void startDTD(in AString name, in AString publicId, in AString systemId)

 Report the beginning of some internal and external XML entities.

 Because of the streaming event model that SAX uses, some
 entity boundaries cannot be reported under any circumstances:

 1.) general entities within attribute values
 2.) parameter entities within declarations

 These will be silently expanded, with no indication of where
 the original entity boundaries were.

 Note also that the boundaries of character references (which
 are not really entities anyway) are not reported.

 All start/endEntity events must be properly nested.

 @param name The name of the entity.  If it is a parameter
             entity, the name will begin with '%', and if it is the
             external DTD subset, it will be "[dtd]".

void startEntity(in AString name)