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XPath (XML Path Language) is an expression language designed to support the query or transformation of XML documents. It was defined by the World Wide Web Consortium (W3C) in 1999, [1] and can be used to compute values (e.g., strings, numbers, or Boolean values) from the content of an XML document.
Tritium was designed by Hampton Catlin, the creator of languages Sass and Haml and is currently bundled with the Moovweb mobile platform. [1]As with Sass (created to address deficiencies in CSS) and Haml (created to address deficiencies in coding HTML templates), Catlin designed Tritium to address issues he saw with XSLT while preserving the core benefits of a transformation language.
The XPath Data Model is a long specification, and goes into many features unrelated to XML trees. Listed below are key terms from that specification and the XML specification. [3] [4] Instance The data model represented as a sequence. Instance document A document using and conforming to the same sequence/XML tree. Sequence
Compared to XPath 2.0, XPath 3.0 adds the following new features: . Inline function expressions Anonymous functions can be created in an expression context. For example, the expression function ($ a as xs:double, $ b as xs:double) as xs:double {$ a * $ b} creates a function that returns the product of its two arguments.
XPath 2.0 is a version of the XPath language defined by the World Wide Web Consortium, W3C. It became a recommendation on 23 January 2007. [1] As a W3C Recommendation it was superseded by XPath 3.0 on 10 April 2014. XPath is used primarily for selecting parts of an XML document. For this purpose the XML document is modelled as a tree of nodes.
Here is an example of how user registration test is done using Capybara. There is a test to see if the user can continue with the registration process or if there are any holds on him. If he has the requisite credentials, he will be registered and then redirected to the 'Welcome' page. [5]
Document search via XPath 1.0; Document search via CSS3 selectors; XSD Schema validation; XSLT transformation; XML and HTML Builder; Enterprise support is available through tidelift, [9] a paid subscription model, offering commercial support for open source applications.
XPointer is a system for addressing components of XML-based Internet media. It is divided among four specifications: a "framework" that forms the basis for identifying XML fragments, a positional element addressing scheme, a scheme for namespaces, and a scheme for XPath-based addressing.