XPath

XPath is used to navigate through elements and attributes in XML document

Syntax & Terminology

Uses path expressions like in a file system, nodes are selected by path or steps. Most useful ones see below

axisname::nodetest[predicate]

axisname:

For example: ancestor::book - all book ancestors of current node

nodes: see below

predicates:

[1] - first node （W3C, for IE5-9, 0, to solve this in IE, In JavaScript: xml.setProperty("SelectionLanguage","XPath");）
[last()]
//title[@lang] - all title elements having a lang attribute
//title[@lang='en']
/bookstore/book[price>35]/title

wildcard:

Select several paths:

element
- "nodename" - all nodes with such name
- / - root (absolute path)
- // - descendants
  - //book - book element anywhere in the document
  - bookstore//book - book element that are descendants of bookstore
- . - current node
- .. - parent
attribute
- @ attributes
  - //@lang - all attributes named lang in the document
text
namespace
processing-instruction
comment
document

Nodes with no children or parent, i.e. "value" in "<div>value</div>", "attribute" in <node name="attribute">

Nodes or Atomic values

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