The XML Example Document
We will use the following XML document in the examples below.
<title lang="en">Harry Potter</title>
<title lang="en">Learning XML</title>
An axis defines a node-set relative to the current node.
|ancestor||Selects all ancestors (parent, grandparent, etc.) of the current node|
|ancestor-or-self||Selects all ancestors (parent, grandparent, etc.) of the current node and the current node itself|
|attribute||Selects all attributes of the current node|
|child||Selects all children of the current node|
|descendant||Selects all descendants (children, grandchildren, etc.) of the current node|
|descendant-or-self||Selects all descendants (children, grandchildren, etc.) of the current node and the current node itself|
|following||Selects everything in the document after the closing tag of the current node|
|following-sibling||Selects all siblings after the current node|
|namespace||Selects all namespace nodes of the current node|
|parent||Selects the parent of the current node|
|preceding||Selects all nodes that appear before the current node in the document, except ancestors, attribute nodes and namespace nodes|
|preceding-sibling||Selects all siblings before the current node|
|self||Selects the current node|
Location Path Expression
A location path can be absolute or relative.
An absolute location path starts with a slash ( / ) and a relative location path does not. In both cases the location path consists of one or more steps, each separated by a slash:
A relative location path:
Each step is evaluated against the nodes in the current node-set.
A step consists of:
- an axis (defines the tree-relationship between the selected nodes and the current node)
- a node-test (identifies a node within an axis)
- zero or more predicates (to further refine the selected node-set)
The syntax for a location step is:
|child::book||Selects all book nodes that are children of the current node|
|attribute::lang||Selects the lang attribute of the current node|
|child::*||Selects all element children of the current node|
|attribute::*||Selects all attributes of the current node|
|child::text()||Selects all text node children of the current node|
|child::node()||Selects all children of the current node|
|descendant::book||Selects all book descendants of the current node|
|ancestor::book||Selects all book ancestors of the current node|
|ancestor-or-self::book||Selects all book ancestors of the current node - and the current as well if it is a book node|
|child::*/child::price||Selects all price grandchildren of the current node|
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