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XPointer supports addressing into the internal structures of XML documents.
xpointer() scheme
Locates an element(s) by specifying an (extended) XPath expression.
xpointer( //test[2])
Extension methods to specify string ranges and points.
Bare Names
Locates an element by specifying the id() attribute value.
test <==> xpointer( id("test"))Child Sequences
Locates an element by stepwise navigation using a sequence of integers separated by slashes (/).
/1/2/3 ==> xpointer( /*[1]/*[2]/*[3])
test/1/2/3 ==> xpointer( id("test")/*[1]/*[2]/*[3])xmlns() scheme
Establishes a namespace prefix mapping, used by xpointer scheme.
xmlns(pre=http://www.test.com/)xpointer( //pre:test)
Specify as URI fragment.
http://www.test.com/test.xml#test
http://www.test.com/test.xml#xpointer( id("test"))http://www.test.com/test.xml#/1/2/3
http://www.test.com/test.xml#xpointer( /*[1]/*[2]/*[3])
http://www.test.com/test.xml#test/1/2/3
http://www.test.com/test.xml#xpointer( id("test")/*[1]/*[2]/*[3])http://www.test.com/test.xml#xmlns(pre=http://www.test.com/)xpointer( //pre:test)
Limited tool support (currently only partly supported as part of XInclude implementation for Xerces and XOM).