The following constants are defined for XML error codes (as returned by xml_parse): XML_ERROR_NONE XML_ERROR_NO_MEMORY XML_ERROR_SYNTAX XML_ERROR_NO_ELEMENTS XML_ERROR_INVALID_TOKEN XML_ERROR_UNCLOSED_TOKEN XML_ERROR_PARTIAL_CHAR XML_ERROR_TAG_MISMATCH XML_ERROR_DUPLICATE_ATTRIBUTE XML_ERROR_JUNK_AFTER_DOC_ELEMENT XML_ERROR_PARAM_ENTITY_REF XML_ERROR_UNDEFINED_ENTITY XML_ERROR_RECURSIVE_ENTITY_REF XML_ERROR_ASYNC_ENTITY XML_ERROR_BAD_CHAR_REF XML_ERROR_BINARY_ENTITY_REF XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF XML_ERROR_MISPLACED_XML_PI XML_ERROR_UNKNOWN_ENCODING XML_ERROR_INCORRECT_ENCODING XML_ERROR_UNCLOSED_CDATA_SECTION XML_ERROR_EXTERNAL_ENTITY_HANDLING