Predefined Constants
 
The constants below are defined by this extension, and
will only be available when the extension has either
been compiled into PHP or dynamically loaded at runtime.
 
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    XML_ERROR_NONE(integer)
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    XML_ERROR_NO_MEMORY(integer)
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    XML_ERROR_SYNTAX(integer)
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    XML_ERROR_NO_ELEMENTS(integer)
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    XML_ERROR_INVALID_TOKEN(integer)
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    XML_ERROR_UNCLOSED_TOKEN(integer)
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    XML_ERROR_PARTIAL_CHAR(integer)
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    XML_ERROR_TAG_MISMATCH(integer)
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    XML_ERROR_DUPLICATE_ATTRIBUTE(integer)
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    XML_ERROR_JUNK_AFTER_DOC_ELEMENT(integer)
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    XML_ERROR_PARAM_ENTITY_REF(integer)
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    XML_ERROR_UNDEFINED_ENTITY(integer)
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    XML_ERROR_RECURSIVE_ENTITY_REF(integer)
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    XML_ERROR_ASYNC_ENTITY(integer)
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    XML_ERROR_BAD_CHAR_REF(integer)
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    XML_ERROR_BINARY_ENTITY_REF(integer)
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    XML_ERROR_ATTRIBUTE_EXTERNAL_ENTITY_REF(integer)
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    XML_ERROR_MISPLACED_XML_PI(integer)
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    XML_ERROR_UNKNOWN_ENCODING(integer)
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    XML_ERROR_INCORRECT_ENCODING(integer)
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    XML_ERROR_UNCLOSED_CDATA_SECTION(integer)
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    XML_ERROR_EXTERNAL_ENTITY_HANDLING(integer)
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    XML_OPTION_CASE_FOLDING(integer)
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    XML_OPTION_TARGET_ENCODING(integer)
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    XML_OPTION_SKIP_TAGSTART(integer)
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    XML_OPTION_SKIP_WHITE(integer)
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    XML_SAX_IMPL(string)
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     Holds the SAX implementation method.
     Can be libxml or expat.