&reftitle.constants; &extension.constants; LIBXML_NOENT (integer) Substitute entities LIBXML_DTDLOAD (integer) Load the external subset LIBXML_DTDATTR (integer) Default DTD attributes LIBXML_DTDVALID (integer) Validate with the DTD LIBXML_NOERROR (integer) Suppress error reports LIBXML_NOWARNING (integer) Suppress warning reports LIBXML_NOBLANKS (integer) Remove blank nodes LIBXML_XINCLUDE (integer) Implement XInclude substitition LIBXML_NSCLEAN (integer) Remove redundant namespaces declarations LIBXML_NOCDATA (integer) Merge CDATA as text nodes LIBXML_NONET (integer) Disable network access when loading documents These constants were added in PHP 5.1.0.