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</style><title>Entities or no entities</title></head><bodybgcolor="#8b7765"text="#000000"link="#a06060"vlink="#000000"><tableborder="0"width="100%"cellpadding="5"cellspacing="0"align="center"><tr><tdwidth="120"><ahref="http://swpat.ffii.org/"><imgsrc="epatents.png"alt="Action against software patents"/></a></td><tdwidth="180"><ahref="http://www.gnome.org/"><imgsrc="gnome2.png"alt="Gnome2 Logo"/></a><ahref="http://www.w3.org/Status"><imgsrc="w3c.png"alt="W3C Logo"/></a><ahref="http://www.redhat.com/"><imgsrc="redhat.gif"alt="Red Hat Logo"/></a><divalign="left"><ahref="http://xmlsoft.org/"><imgsrc="Libxml2-Logo-180x168.gif"alt="Made with Libxml2 Logo"/></a></div></td><td><tableborder="0"width="90%"cellpadding="2"cellspacing="0"align="center"bgcolor="#000000"><tr><td><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"bgcolor="#fffacd"><tr><tdalign="center"><h1>The XML C parser and toolkit of Gnome</h1><h2>Entities or no entities</h2></td></tr></table></td></tr></table></td></tr></table><tableborder="0"cellpadding="4"cellspacing="0"width="100%"align="center"><tr><tdbgcolor="#8b7765"><tableborder="0"cellspacing="0"cellpadding="2"width="100%"><tr><tdvalign="top"width="200"bgcolor="#8b7765"><tableborder="0"cellspacing="0"cellpadding="1"width="100%"bgcolor="#000000"><tr><td><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>Developer Menu</b></center></td></tr><tr><tdbgcolor="#fffacd"><formaction="search.php"enctype="application/x-www-form-urlencoded"method="get"><inputname="query"type="text"size="20"value=""/><inputname="submit"type="submit"value="Search ..."/></form><ul><li><ahref="index.html"style="font-weight:bold">Main Menu</a></li><li><ahref="html/index.html"style="font-weight:bold">Reference Manual</a></li><li><ahref="examples/index.html"style="font-weight:bold">Code Examples</a></li><li><ahref="guidelines.html">XML Guidelines</a></li><li><ahref="tutorial/index.html">Tutorial</a></li><li><ahref="xmlreader.html">The Reader Interface</a></li><li><ahref="ChangeLog.html">ChangeLog</a></li><li><ahref="XSLT.html">XSLT</a></li><li><ahref="python.html">Python and bindings</a></li><li><ahref="architecture.html">libxml2 architecture</a></li><li><ahref="tree.html">The tree output</a></li><li><ahref="interface.html">The SAX interface</a></li><li><ahref="xmlmem.html">Memory Management</a></li><li><ahref="xmlio.html">I/O Interfaces</a></li><li><ahref="library.html">The parser interfaces</a></li><li><ahref="entities.html">Entities or no entities</a></li><li><ahref="namespaces.html">Namespaces</a></li><li><ahref="upgrade.html">Upgrading 1.x code</a></li><li><ahref="threads.html">Thread safety</a></li><li><ahref="DOM.html">DOM Principles</a></li><li><ahref="example.html">A real example</a></li><li><ahref="xml.html">flat page</a>, <ahref="site.xsl">stylesheet</a></li></ul></td></tr></table><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>API Indexes</b></center></td></tr><tr><tdbgcolor="#fffacd"><ul><li><ahref="APIchunk0.html">Alphabetic</a></li><li><ahref="APIconstructors.html">Constructors</a></li><li><ahref="APIfunctions.html">Functions/Types</a></li><li><ahref="APIfiles.html">Modules</a></li><li><ahref="APIsymbols.html">Symbols</a></li></ul></td></tr></table><tablewidth="100%"border="0"cellspacing="1"cellpadding="3"><tr><tdcolspan="1"bgcolor="#eecfa1"align="center"><center><b>Related links</b></center></td></tr><tr><tdbgcolor="#fffacd"><ul><li><ahref="http://mail.gnome.org/archives/xml/">Mail archive</a></li><li><ahref="http://xmlsoft.org/XSLT/">XSLT libxslt</a></li><li><ahref="http://phd.cs.unibo.it/gdome2/">DOM gdome2</a></li><li><ahref="http://www.aleksey.com/xmlsec/">XML-DSig xmlsec</a></li><li><ahref="ftp://xmlsoft.org/">FTP</a></li><li><ahref="http://www.zlatkovic.com/projects/libxml/">Windows binaries</a></li><li><ahref="http://opencsw.org/packages/l
content= Extensible Markup Language</pre><p>So, entities or no entities? Basically, it depends on your use case. I
suggest that you keep the non-substituting default behaviour and avoid using
entities in your XML document or data if you are not willing to handle the
entity references elements in the DOM tree.</p><p>Note that at save time libxml2 enforces the conversion of the predefined
entities where necessary to prevent well-formedness problems, and will also
transparently replace those with chars (i.e. it will not generate entity
reference elements in the DOM tree or call the reference() SAX callback when
finding them in the input).</p><p><spanstyle="background-color: #FF0000">WARNING</span>: handling entities
on top of the libxml2 SAX interface is difficult!!! If you plan to use
non-predefined entities in your documents, then the learning curve to handle
then using the SAX API may be long. If you plan to use complex documents, I
strongly suggest you consider using the DOM interface instead and let libxml
deal with the complexity rather than trying to do it yourself.</p><p><ahref="bugs.html">Daniel Veillard</a></p></td></tr></table></td></tr></table></td></tr></table></td></tr></table></td></tr></table></body></html>
