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Apache Xalan for C++ XSLT Processor

Apache Xalan for C++ XSLT Processor is an open-source XSLT 1.0 (data transformation) engine and XQuery 1.0 (query) implementation written in C++ for transforming and querying XML documents.

  • XSLT 1.0 processor for transforming XML documents using XSL stylesheets (data transformation).
  • Partial XQuery 1.0 implementation for querying XML data (query processing).
  • C++ language implementation suitable for native integration in C++ applications (application integration).
  • Support for DOM and SAX-based XML input models via companion Apache XML projects (XML processing).
  • Open-source project under The Apache Software Foundation with source distribution, builds, and examples (open-source software).

More About Apache Xalan for C++ XSLT Processor

Apache Xalan for C++ XSLT Processor is an implementation of the World Wide Web Consortium (W3C) XSL Transformations (XSLT) 1.0 recommendation (data transformation) and portions of the W3C XQuery 1.0 specification (query processing) implemented in C++. It provides a programmatic engine that applies XSLT stylesheets to XML documents, producing transformed XML, HTML, text, or other serialized output formats, and supplies XQuery execution capabilities for querying XML data.

The project targets environments where XML processing is embedded into C++ applications (application integration). It exposes C++ APIs that allow developers to load XML documents, associate them with XSLT stylesheets or XQuery expressions, and execute transformations or queries under application control. The implementation uses underlying XML parsers and models from related Apache XML projects (XML processing), and is structured so that callers can work with DOM-like trees or SAX-style event streams, depending on the parsing stack in use.

Core capabilities include compiling and executing XSLT 1.0 stylesheets (data transformation), resolving template rules, handling XPath expressions, and supporting extension functions and elements when provided by the implementation or host application. For XQuery 1.0 (query processing), Xalan-C enables evaluation of queries over XML data, returning result sequences that can be serialized or consumed programmatically. The processor adheres to the relevant W3C specifications where implemented and relies on standard XML technologies such as XML 1.0, XPath 1.0, and namespaces (XML standards).

In enterprise or institutional contexts, Apache Xalan for C++ XSLT Processor is used in C++-based middleware, content management, data integration, and messaging components that require XML transformation or querying as part of internal workflows (enterprise application integration). Because it is implemented in C++, it can be embedded in native services, batch utilities, and on-premises (on-prem) software where a managed runtime is not desired. It can also be combined with other Apache XML libraries for parsing, validation, and schema processing to form a complete XML processing stack (XML toolchain).

From a directory and taxonomy perspective, Apache Xalan for C++ XSLT Processor belongs to the categories of XML transformation engines (data transformation), XQuery processors (query processing), standards-based XML tooling (XML standards tooling), and C++ libraries for enterprise middleware (application integration). It is part of the broader Apache XML ecosystem under The Apache Software Foundation, distributed under an Apache License, and maintained through open-source practices including source releases, mailing lists, and issue tracking.