XML transformation language
From Wikipedia, the free encyclopedia
An XML transformation language is a computer language designed specifically to transform an input XML document into an output XML document which satisfies some specific goal.
There are two special cases of transformation:
- XML to XML : the output document is an XML document.
- XML to Data : the output document is a byte stream.
Contents |
[edit] XML to XML
An XML to XML transformation outputs XML document, it is current to chain XML to XML transformation to form XML pipelines.
[edit] XML to Data
The XML to Data transformation contains some important cases. The most notable one is XML to HTML, as an HTML document is not an XML document.
[edit] Existing languages
- XSLT
- XSLT is the best known XML transformation language. The XSLT 1.0 W3C recommendation was published in 1999 together with XPath 1.0, and it has been widely implemented since then. XSLT 2.0 has become a W3C recommendation since January 2007 and implementations of the specification like SAXON 8 are already available.
- XQuery
- XQuery is also bound to become a W3C standard. XQuery is not an XML application, like XSLT. Consequently its syntax is much lighter. The language is based on XPath 2.0. XQuery programs cannot have side-effects, just like XSLT and provides almost the same capabilities (for instance: declaring variables and functions, iterating over sequences, using W3C schema types), even though the program syntax are quite different. In addition to the syntax, the main difference between XSLT and XQuery is the XSLT push processing model, where certain conditions of the input document trigger the execution of templates, which is not shared with XQuery.
- STX
- STX (Streaming Transformations for XML) is inspired by XSLT but has been designed to allow a one-pass transformation process that never prevents streaming. Implementations are available in Java (Joost) and Perl (XML::STX).
- XML Script
- An imperative scripting language inspired by Perl that uses the XML syntax. XML Script supports XPath as well as its proprietary DSLPath for selecting nodes from the input tree.
- FXT
- A Functional XML Transformation Tool, implemented in Standard ML.
- XDuce
- A typed language with a lightweight syntax (compared to XSLT). The implementation is written in ML.
- CDuce
- Extends XDuce to a general-purpose functional programming language, see CDuce homepage.
- XStream
- A simple functional transformation language for XML documents based on CAML. XML transformations written in XStream are evaluated in streaming: when possible, parts of the output are computed and produced while the input document is still being parsed. Some transformations can thus be applied to huge XML documents which would not even fit in memory. The XStream compiler is distributed under the terms of the CeCILL free software license.
- Xtatic
- Applies techniques from XDuce to C#, see Xtatic homepage.
- HaXml
- A library and collection of tools to write XML transformations in Haskell. Its approach is very consistent and powerful. Also see this paper about HaXml published in 1999 and this IBM developerWorks article. See also the more recent HXML and Haskell XML Toolbox (HXT), which is based on the ideas of HaXml and HXML but takes a more general approach to XML processing.
- XMLambda
- XMLambda (XMλ) is described in a 1999 paper by Erik Meijer and Mark Shields. No implementation is available. See XMLambda home page.
- FleXML
- FleXML is an XML processing language first implemented by Kristofer Rose. Its approach is to add actions to an XML DTD specifying processing instructions for any subset of the DTD's rules.
- XML Sapiens
- A paradigm of the managed sites building, a way for the independent aspects’ effective integration: data, design, and functionality.
- Scala
- A general-purpose functional and object-oriented language with specific support for XML transformation in the form of XML pattern matching, literals, and expressions, along with standard XML libraries.
