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下列常量是为 XML 定义的相关错误代码（xml_parse() 的返回值）：
XML_ERROR_NONEXML_ERROR_NO_MEMORYXML_ERROR_SYNTAXXML_ERROR_NO_ELEMENTSXML_ERROR_INVALID_TOKENXML_ERROR_UNCLOSED_TOKENXML_ERROR_PARTIAL_CHARXML_ERROR_TAG_MISMATCHXML_ERROR_DUPLICATE_ATTRIBUTEXML_ERROR_JUNK_AFTER_DOC_ELEMENTXML_ERROR_PARAM_ENTITY_REFXML_ERROR_UNDEFINED_ENTITYXML_ERROR_RECURSIVE_ENTITY_REFXML_ERROR_ASYNC_ENTITYXML_ERROR_BAD_CHAR_REFXML_ERROR_BINARY_ENTITY_REFXML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REFXML_ERROR_MISPLACED_XML_PIXML_ERROR_UNKNOWN_ENCODINGXML_ERROR_INCORRECT_ENCODINGXML_ERROR_UNCLOSED_CDATA_SECTIONXML_ERROR_EXTERNAL_ENTITY_HANDLING
