1. Selenium Element Locator
   1. identifier=id
   2. id=id
   3. name=name
   4. dom=javascriptExpression
   5. xpath=xpathExpression
   6. link=textPattern
   7. css=cssSelectorSyntax
2. What?
   1. XPath uses path expressions to navigate in XML documents
   2. XPath contains a library of standard functions
   3. XPath is a major element in XSLT
   4. XPath is a W3C recommendation
3. Nodes
   1. types
      1. element
      2. attribute
      3. text
      4. namespace
      5. processing-instruction
      6. comment
      7. document nodes
   2. relationship (tree)
      1. parent
      2. children
      3. siblings
      4. ancestors
      5. descendants
4. path expression
   1. expressions
      1. /
         1. Selects from the root node
      2. //
         1. Selects nodes in the document from the current node that match the selection no matter where they are
      3. .
         1. Selects the current node
      4. ..
         1. Selects the parent of the current node
      5. @
         1. Selects attributes
   2. Predicates
      1. sequence
         1. /bookstore/book[1]
      2. function
         1. /bookstore/book[last()]
      3. attribute
         1. //title[@lang='eng']
      4. sub element
         1. /bookstore/book[price>35.00]
      5. logical operator
         1. /bookstore/book[price>35.00 and @type='WEB']
   3. wildcards
      1. *
         1. Matches any element node
      2. @*
         1. Matches any attribute node
      3. node()
         1. Matches any node of any kind
   4. axes
      1. axisname::nodetest[predicate]
      2. types
         1. ancestor
         2. following-sibling
         3. attribute
         4. etc...
   5. operators
      1. |
         1. //book/title | //book/price
      2. and
         1. price>9.00 and price<9.90
      3. etc...