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XPath 3.0 became a Recommendation on 8 April 2014. [4] The most significant new feature is support for functions as first-class values. [5] XPath 3.0 is a subset of XQuery 3.0, and most current implementations (April 2014) exist as part of an XQuery 3.0 engine. XPath 3.1 became a Recommendation on 21 March 2017. [6]
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.
It makes it possible to read and write XML data using a programming language class library (e.g. C++, C#, Java), specifically created for a given XML data format. [1] Whilst it is possible to manually write a computer program to achieve this, XML data binding tools generate the source code to perform these tasks.
XPath/XQuery: Databases, data processing, scripting No No Yes No No No Tree-oriented: Yes 1999 W3C XPath 1, 2010 W3C XQuery 1, 2014 W3C XPath/XQuery 3.0 Zeek: Domain-specific, application Yes No No No No No No Zig: Application, general, system Yes No Yes Yes Yes Yes Concurrent No Zsh: Shell, scripting: Yes No No Yes No No Loadable modules ...
[4] AsQueryable: Statically types the collection as an IQueryable<T>. ToArray: Creates an array T[] from the collection. ToList: Creates a List<T> from the collection. ToDictionary: Creates a Dictionary<K, T> from the collection, indexed by the key K. A user supplied projection function extracts a key from each element.
Classes are reference types and structs are value types. A structure is allocated on the stack when it is declared and the variable is bound to its address. It directly contains the value. Classes are different because the memory is allocated as objects on the heap. Variables are rather managed pointers on the stack which point to the objects.
The work is closely coordinated with the development of XSLT by the XSL Working Group; the two groups share responsibility for XPath, which is a subset of XQuery. XQuery 1.0 became a W3C Recommendation on January 23, 2007. [4] XQuery 3.0 became a W3C Recommendation on April 8, 2014. [5] XQuery 3.1 became a W3C Recommendation on March 21, 2017. [6]
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.