expat - External Entity References
int * XML_ExternalEntityRefHandler(parser, context, base, sysID, pubID)
void XML_SetExternalEntityRefHandler(parser, handler)
Entity is not automatically parsed (use XML_ExternalEntityParserCreate now or later). pubID may be null. base is (programmer-set) base for resolving System ID. context is the open entity stack.
parser XML_ExternalEntityParserCreate(parser, context, encoding)
parser argument is parser handling parent entity. context is a tokenized list describing open-entity stack. The new parser inherits all the handlers and settings from the parent.
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