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| <h1>The XML C parser and toolkit of Gnome</h1> |
| <h2>libxml</h2> |
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| <p></p> |
| <p>Libxml2 is the XML C parser and toolkit developed for the Gnome project |
| (but usable outside of the Gnome platform). XML itself is a metalanguage to |
| design markup languages, i.e. text language where semantic and structure are |
| added to the content using extra "markup" information enclosed between angle |
| brackets. HTML is the most well-known markup language. Though the library is |
| written in C <a href="python.html">a variety of language bindings</a> make it |
| available in other environments.</p> |
| <p>Libxml2 is known to be very portable, the library should build and work |
| without serious troubles on a variety of systems (Linux, Unix, Windows, |
| CygWin, MacOS, MacOS X, RISC Os, OS/2, VMS, QNX, MVS, ...)</p> |
| <p>Libxml2 implements a number of existing standards related to markup |
| languages:</p> |
| <ul><li>the XML standard: <a href="http://www.w3.org/TR/REC-xml">http://www.w3.org/TR/REC-xml</a></li> |
| <li>Namespaces in XML: <a href="http://www.w3.org/TR/REC-xml-names/">http://www.w3.org/TR/REC-xml-names/</a></li> |
| <li>XML Base: <a href="http://www.w3.org/TR/xmlbase/">http://www.w3.org/TR/xmlbase/</a></li> |
| <li><a href="http://www.cis.ohio-state.edu/rfc/rfc2396.txt">RFC 2396</a> : |
| Uniform Resource Identifiers <a href="http://www.ietf.org/rfc/rfc2396.txt">http://www.ietf.org/rfc/rfc2396.txt</a></li> |
| <li>XML Path Language (XPath) 1.0: <a href="http://www.w3.org/TR/xpath">http://www.w3.org/TR/xpath</a></li> |
| <li>HTML4 parser: <a href="http://www.w3.org/TR/html401/">http://www.w3.org/TR/html401/</a></li> |
| <li>most of XML Pointer Language (XPointer) Version 1.0: <a href="http://www.w3.org/TR/xptr">http://www.w3.org/TR/xptr</a></li> |
| <li>XML Inclusions (XInclude) Version 1.0: <a href="http://www.w3.org/TR/xinclude/">http://www.w3.org/TR/xinclude/</a></li> |
| <li>[ISO-8859-1], <a href="http://www.cis.ohio-state.edu/rfc/rfc2044.txt">rfc2044</a> [UTF-8] |
| and <a href="http://www.cis.ohio-state.edu/rfc/rfc2781.txt">rfc2781</a> |
| [UTF-16] core encodings</li> |
| <li>part of SGML Open Technical Resolution TR9401:1997</li> |
| <li>XML Catalogs Working Draft 06 August 2001: <a href="http://www.oasis-open.org/committees/entity/spec-2001-08-06.html">http://www.oasis-open.org/committees/entity/spec-2001-08-06.html</a></li> |
| <li>Canonical XML Version 1.0: <a href="http://www.w3.org/TR/xml-c14n">http://www.w3.org/TR/xml-c14n</a> |
| and the Exclusive XML Canonicalization CR draft <a href="http://www.w3.org/TR/xml-exc-c14n">http://www.w3.org/TR/xml-exc-c14n</a></li> |
| <li>Relax NG Committee Specification 3 December 2001 <a href="http://www.oasis-open.org/committees/relax-ng/spec-20011203.html">http://www.oasis-open.org/committees/relax-ng/spec-20011203.html</a></li> |
| <li>W3C XML Schemas Part 2: Datatypes <a href="http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/">REC 02 May |
| 2001</a> except the base64Binary and hexBinary types</li> |
| </ul> |
| <p>In most cases libxml2 tries to implement the specifications in a |
| relatively strictly compliant way. As of release 2.4.16, libxml2 passes all |
| 1800+ tests from the <a href="http://www.oasis-open.org/committees/xml-conformance/">OASIS XML Tests |
| Suite</a>.</p> |
| <p>To some extent libxml2 provides support for the following additional |
| specifications but doesn't claim to implement them completely:</p> |
| <ul><li>Document Object Model (DOM) <a href="http://www.w3.org/TR/DOM-Level-2-Core/">http://www.w3.org/TR/DOM-Level-2-Core/</a> |
| it doesn't implement the API itself, gdome2 does this on top of |
| libxml2</li> |
| <li><a href="http://www.cis.ohio-state.edu/rfc/rfc959.txt">RFC 959</a> : |
| libxml2 implements a basic FTP client code</li> |
| <li><a href="http://www.cis.ohio-state.edu/rfc/rfc1945.txt">RFC 1945</a> : |
| HTTP/1.0, again a basic HTTP client code</li> |
| <li>SAX: a minimal SAX implementation compatible with early expat |
| versions</li> |
| <li>DocBook SGML v4: libxml2 includes a hackish parser to transition to |
| XML</li> |
| </ul> |
| <p>A partial implementation of <a href="http://www.w3.org/TR/2001/REC-xmlschema-1-20010502/">XML Schemas Part |
| 1: Structure</a> is being worked on but it would be far too early to make any |
| conformance statement about it at the moment.</p> |
| <p>Separate documents:</p> |
| <ul><li><a href="http://xmlsoft.org/XSLT/">the libxslt page</a> providing an |
| implementation of XSLT 1.0 and common extensions like EXSLT for |
| libxml2</li> |
| <li><a href="http://www.cs.unibo.it/~casarini/gdome2/">the gdome2 page</a> |
| : a standard DOM2 implementation for libxml2</li> |
| <li><a href="http://www.aleksey.com/xmlsec/">the XMLSec page</a>: an |
| implementation of <a href="http://www.w3.org/TR/xmldsig-core/">W3C XML |
| Digital Signature</a> for libxml2</li> |
| <li>also check the related links section below for more related and active |
| projects.</li> |
| </ul> |
| <p>Results of the <a href="http://xmlbench.sourceforge.net/results/benchmark/index.html">xmlbench |
| benchmark</a> on sourceforge 19 March 2003 (smaller is better):</p> |
| <p align="center"> |
| <img src="benchmark.gif" alt="benchmark results for Expat Xerces libxml2 Oracle and Sun toolkits" /> |
| </p> |
| <p>Logo designed by <a href="mailto:liyanage@access.ch">Marc Liyanage</a>.</p> |
| <p> |
| <a href="bugs.html">Daniel Veillard</a> |
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