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.

**XML constants**
Constant	Value	Description
`XML_ELEMENT_NODE` (integer)	1	Node is an element
`XML_ATTRIBUTE_NODE` (integer)	2	Node is an attribute
`XML_TEXT_NODE` (integer)	3	Node is a piece of text
`XML_CDATA_SECTION_NODE` (integer)	4
`XML_ENTITY_REF_NODE` (integer)	5
`XML_ENTITY_NODE` (integer)	6	Node is an entity like
`XML_PI_NODE` (integer)	7	Node is a processing instruction
`XML_COMMENT_NODE` (integer)	8	Node is a comment
`XML_DOCUMENT_NODE` (integer)	9	Node is a document
`XML_DOCUMENT_TYPE_NODE` (integer)	10
`XML_DOCUMENT_FRAG_NODE` (integer)	11
`XML_NOTATION_NODE` (integer)	12
`XML_GLOBAL_NAMESPACE` (integer)	1
`XML_LOCAL_NAMESPACE` (integer)	2
`XML_HTML_DOCUMENT_NODE` (integer)
`XML_DTD_NODE` (integer)
`XML_ELEMENT_DECL_NODE` (integer)
`XML_ATTRIBUTE_DECL_NODE` (integer)
`XML_ENTITY_DECL_NODE` (integer)
`XML_NAMESPACE_DECL_NODE` (integer)
`XML_ATTRIBUTE_CDATA` (integer)
`XML_ATTRIBUTE_ID` (integer)
`XML_ATTRIBUTE_IDREF` (integer)
`XML_ATTRIBUTE_IDREFS` (integer)
`XML_ATTRIBUTE_ENTITY` (integer)
`XML_ATTRIBUTE_NMTOKEN` (integer)
`XML_ATTRIBUTE_NMTOKENS` (integer)
`XML_ATTRIBUTE_ENUMERATION` (integer)
`XML_ATTRIBUTE_NOTATION` (integer)
`XPATH_UNDEFINED` (integer)
`XPATH_NODESET` (integer)
`XPATH_BOOLEAN` (integer)
`XPATH_NUMBER` (integer)
`XPATH_STRING` (integer)
`XPATH_POINT` (integer)
`XPATH_RANGE` (integer)
`XPATH_LOCATIONSET` (integer)
`XPATH_USERS` (integer)
`XPATH_NUMBER` (integer)