Callback to invoke for comments, processing instructions
and doctype declarations; if you're re-writing the parsed document,
write the passthrough text back out in the same position. If the
G_MARKUP_TREAT_CDATA_AS_TEXT flag is not set, this function is also
called for CDATA marked sections.
Callback to invoke for comments, processing instructions and doctype declarations; if you're re-writing the parsed document, write the passthrough text back out in the same position. If the G_MARKUP_TREAT_CDATA_AS_TEXT flag is not set, this function is also called for CDATA marked sections.