OptionalbaseOptionalencodingnull will do content sniffing.
Optionalexpandexpand internal entities
Optionalseparatorthe separator for namespace URI and element/attribute name. Use XmlParser.NO_NAMESPACES to get Expat's old, broken namespace non-implementation via XmlParserCreate instead of XmlParserCreateNS.
Optionalsystemexpand external entities using this callback
Base URI for inclusions