XPATH Quick Reference
See also http://www.zvon.org/xxl/XPathTutorial/General/examples.html
Basic syntax
| nodename | Selects all child nodes of the node |
| / | Selects from the root node |
| // | Selects nodes descending from the current node no matter where they are |
| . | Selects the current node |
| .. | Selects the parent of the current node |
| @ | Selects attributes |
| * | Matches any element node |
| @* | Matches any attribute node |
| node() | Matches any node of any kind |
| [ predicate ] | Predicates are used to find a specific node or a node that contains a specific value. |
| path | path | Use the | operator to match several paths |
Node Set Functions
| last() | Returns a number equal to the context size from the expression evaluation context. |
| position() | Returns a number equal to the context position from the expression evaluation context. |
| count(node-set) | Returns the number of nodes in the argument node-set. |
String functions
| concat(string, string, string*) |
| starts-with(string, string) |
| contains(string, string) |
| substring-before(string, string) |
| substring-after(string, string) |
| substring(string, number, number?) |
| string-length(string?) |
| normalize-space(string?) |
| translate(string, match-char-set, replacement-char-set) |
Number function
| sum(node-set) |
| floor(number) |
| ceiling(number) |
| round(number) |
Some examples:
| /bookstore/book[1] | Selects the first book element that is the child of the bookstore element |
| /bookstore/book[last()] | Selects the last book element that is the child of the bookstore element |
| /bookstore/book[last()-1] | Selects the last but one book element that is the child of the bookstore element |
| /bookstore/book[position()<3] | Selects the first two book elements that are children of the bookstore element |
| //title[@lang] | Selects all the title elements that have an attribute named lang |
| //title[@lang='eng'] | Selects all the title elements that have an attribute named lang with a value of 'eng' |
| /bookstore/book[price>35.00] | Selects all the book elements of the bookstore element that have a price element with a value greater than 35.00 |
| /bookstore/book[price>35.00]/title | Selects all the title elements of the book elements of the bookstore element that have a price element with a value greater than 35.00 |
| //book/title | //book/price | Selects all the title AND price elements of all book elements |
| //title | //price | Selects all the title AND price elements in the document |
| /bookstore/book/title | //price | Selects all the title elements of the book element of the bookstore element AND all the price elements in the document |
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