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author | William Joye <wjoye@cfa.harvard.edu> | 2016-11-17 21:10:17 (GMT) |
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committer | William Joye <wjoye@cfa.harvard.edu> | 2016-11-17 21:10:17 (GMT) |
commit | 8096d34300076a1aa9cb517de49fb920a051939f (patch) | |
tree | 5f2b1b7c41f89fedc31af973d6a747ca674cfd24 /libxml2/doc/namespaces.html | |
parent | fc7f7edd0b8011cb71573b15462ef83068d9e54b (diff) | |
parent | 574585fa78070b0cc6b5ad22543e21a3502a122b (diff) | |
download | blt-8096d34300076a1aa9cb517de49fb920a051939f.zip blt-8096d34300076a1aa9cb517de49fb920a051939f.tar.gz blt-8096d34300076a1aa9cb517de49fb920a051939f.tar.bz2 |
Merge commit '574585fa78070b0cc6b5ad22543e21a3502a122b' as 'libxml2'
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-rw-r--r-- | libxml2/doc/namespaces.html | 50 |
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diff --git a/libxml2/doc/namespaces.html b/libxml2/doc/namespaces.html new file mode 100644 index 0000000..878f7fe --- /dev/null +++ b/libxml2/doc/namespaces.html @@ -0,0 +1,50 @@ +<?xml version="1.0" encoding="UTF-8"?> +<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> +<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><link rel="SHORTCUT ICON" href="/favicon.ico" /><style type="text/css"> +TD {font-family: Verdana,Arial,Helvetica} +BODY {font-family: Verdana,Arial,Helvetica; margin-top: 2em; margin-left: 0em; margin-right: 0em} +H1 {font-family: Verdana,Arial,Helvetica} +H2 {font-family: Verdana,Arial,Helvetica} +H3 {font-family: Verdana,Arial,Helvetica} +A:link, A:visited, A:active { text-decoration: underline } +</style><title>Namespaces</title></head><body bgcolor="#8b7765" text="#000000" link="#a06060" vlink="#000000"><table border="0" width="100%" cellpadding="5" cellspacing="0" align="center"><tr><td width="120"><a href="http://swpat.ffii.org/"><img src="epatents.png" alt="Action against software patents" /></a></td><td width="180"><a href="http://www.gnome.org/"><img src="gnome2.png" alt="Gnome2 Logo" /></a><a href="http://www.w3.org/Status"><img src="w3c.png" alt="W3C Logo" /></a><a href="http://www.redhat.com/"><img src="redhat.gif" alt="Red Hat Logo" /></a><div align="left"><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-180x168.gif" alt="Made with Libxml2 Logo" /></a></div></td><td><table border="0" width="90%" cellpadding="2" cellspacing="0" align="center" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3" bgcolor="#fffacd"><tr><td align="center"><h1>The XML C parser and toolkit of Gnome</h1><h2>Namespaces</h2></td></tr></table></td></tr></table></td></tr></table><table border="0" cellpadding="4" cellspacing="0" width="100%" align="center"><tr><td bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="2" width="100%"><tr><td valign="top" width="200" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table width="100%" border="0" cellspacing="1" cellpadding="3"><tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Main Menu</b></center></td></tr><tr><td bgcolor="#fffacd"><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="20" value="" /><input name="submit" type="submit" value="Search ..." /></form><ul><li><a href="index.html">Home</a></li><li><a href="html/index.html">Reference Manual</a></li><li><a href="intro.html">Introduction</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="docs.html" style="font-weight:bold">Developer Menu</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a href="help.html">How to help</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="news.html">Releases</a></li><li><a href="XMLinfo.html">XML</a></li><li><a href="XSLT.html">XSLT</a></li><li><a href="xmldtd.html">Validation & DTDs</a></li><li><a href="encoding.html">Encodings support</a></li><li><a href="catalog.html">Catalog support</a></li><li><a href="namespaces.html">Namespaces</a></li><li><a href="contribs.html">Contributions</a></li><li><a href="examples/index.html" style="font-weight:bold">Code Examples</a></li><li><a href="html/index.html" style="font-weight:bold">API Menu</a></li><li><a href="guidelines.html">XML Guidelines</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></td></tr></table><table width="100%" border="0" cellspacing="1" cellpadding="3"><tr><td colspan="1" bgcolor="#eecfa1" align="center"><center><b>Related links</b></center></td></tr><tr><td bgcolor="#fffacd"><ul><li><a href="http://mail.gnome.org/archives/xml/">Mail archive</a></li><li><a href="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li><li><a href="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li><li><a href="http://www.aleksey.com/xmlsec/">XML-DSig xmlsec</a></li><li><a href="ftp://xmlsoft.org/">FTP</a></li><li><a href="http://www.zlatkovic.com/projects/libxml/">Windows binaries</a></li><li><a href="http://opencsw.org/packages/libxml2">Solaris binaries</a></li><li><a href="http://www.explain.com.au/oss/libxml2xslt.html">MacOsX binaries</a></li><li><a href="http://lxml.de/">lxml Python bindings</a></li><li><a href="http://cpan.uwinnipeg.ca/dist/XML-LibXML">Perl bindings</a></li><li><a href="http://libxmlplusplus.sourceforge.net/">C++ bindings</a></li><li><a href="http://www.zend.com/php5/articles/php5-xmlphp.php#Heading4">PHP bindings</a></li><li><a href="http://sourceforge.net/projects/libxml2-pas/">Pascal bindings</a></li><li><a href="http://libxml.rubyforge.org/">Ruby bindings</a></li><li><a href="http://tclxml.sourceforge.net/">Tcl bindings</a></li><li><a href="http://bugzilla.gnome.org/buglist.cgi?product=libxml2">Bug Tracker</a></li></ul></td></tr></table></td></tr></table></td><td valign="top" bgcolor="#8b7765"><table border="0" cellspacing="0" cellpadding="1" width="100%"><tr><td><table border="0" cellspacing="0" cellpadding="1" width="100%" bgcolor="#000000"><tr><td><table border="0" cellpadding="3" cellspacing="1" width="100%"><tr><td bgcolor="#fffacd"><p>The libxml2 library implements <a href="http://www.w3.org/TR/REC-xml-names/">XML namespaces</a> support by +recognizing namespace constructs in the input, and does namespace lookup +automatically when building the DOM tree. A namespace declaration is +associated with an in-memory structure and all elements or attributes within +that namespace point to it. Hence testing the namespace is a simple and fast +equality operation at the user level.</p><p>I suggest that people using libxml2 use a namespace, and declare it in the +root element of their document as the default namespace. Then they don't need +to use the prefix in the content but we will have a basis for future semantic +refinement and merging of data from different sources. This doesn't increase +the size of the XML output significantly, but significantly increases its +value in the long-term. Example:</p><pre><mydoc xmlns="http://mydoc.example.org/schemas/"> + <elem1>...</elem1> + <elem2>...</elem2> +</mydoc></pre><p>The namespace value has to be an absolute URL, but the URL doesn't have to +point to any existing resource on the Web. It will bind all the element and +attributes with that URL. I suggest to use an URL within a domain you +control, and that the URL should contain some kind of version information if +possible. For example, <code>"http://www.gnome.org/gnumeric/1.0/"</code> is a +good namespace scheme.</p><p>Then when you load a file, make sure that a namespace carrying the +version-independent prefix is installed on the root element of your document, +and if the version information don't match something you know, warn the user +and be liberal in what you accept as the input. Also do *not* try to base +namespace checking on the prefix value. <foo:text> may be exactly the +same as <bar:text> in another document. What really matters is the URI +associated with the element or the attribute, not the prefix string (which is +just a shortcut for the full URI). In libxml, element and attributes have an +<code>ns</code> field pointing to an xmlNs structure detailing the namespace +prefix and its URI.</p><p>@@Interfaces@@</p><pre>xmlNodePtr node; +if(!strncmp(node->name,"mytag",5) + && node->ns + && !strcmp(node->ns->href,"http://www.mysite.com/myns/1.0")) { + ... +}</pre><p>Usually people object to using namespaces together with validity checking. +I will try to make sure that using namespaces won't break validity checking, +so even if you plan to use or currently are using validation I strongly +suggest adding namespaces to your document. A default namespace scheme +<code>xmlns="http://...."</code> should not break validity even on less +flexible parsers. Using namespaces to mix and differentiate content coming +from multiple DTDs will certainly break current validation schemes. To check +such documents one needs to use schema-validation, which is supported in +libxml2 as well. See <a href="http://www.relaxng.org/">relagx-ng</a> and <a href="http://www.w3c.org/XML/Schema">w3c-schema</a>.</p><p><a href="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html> |