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The Java package javax.xml.xpath has been part of Java standard edition since Java 5 [8] via the Java API for XML Processing. Technically this is an XPath API rather than an XPath implementation, and it allows the programmer the ability to select a specific implementation that conforms to the interface.
The stable version of dom4j for Java 1.4, 1.6.1, was released on May 16, 2005. The stable version of dom4j for Java 1.5, 2.0.3, was released on April 11, 2020. The stable version of dom4j, 2.1.3, was released on April 12, 2020. The latest stable version of dom4j, 2.1.4, was released on January 22, 2023.
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.
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.
The "/" operator is generalized in XPath 2.0 to allow any kind of expression to be used as an operand: in XPath 1.0, the right-hand side was always an axis step. For example, a function call can be used on the right-hand side. The typing rules for the operator require that the result of the first operand is a sequence of nodes.
The fourth technology platform is JavaScript. Previously the open-source XSLT processor Saxon-CE was cross-compiled from the common Java source using GWT. SaxonJS is a completely new implementation in JavaScript. The XSLT sources can either be compiled using Saxon-EE or using a built-in XSLT-based XSLT compiler, which creates less optimized code.
XSLT 3.0 will work with either XPath 3.0 or 3.1. In the case of 1.0 and 2.0, the XSLT and XPath specifications were published on the same date. With 3.0, however, they were no longer synchronized; XPath 3.0 became a Recommendation in April 2014, followed by XPath 3.1 in February 2017; XSLT 3.0 followed in June 2017.
XQuery (XML Query) is a query and functional programming language that queries and transforms collections of structured and unstructured data, usually in the form of XML, text and with vendor-specific extensions for other data formats (JSON, binary, etc.).