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<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE section PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
"http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
<section id="validating-xml-files">
<title>Validating XML files against the DTDs</title>
<para>
<acronym>DTD</acronym>s exist for the <acronym>XML</acronym> file formats
supported by libaccounts-glib. Using these DTDs, it is possible to validate the
XML data files for errors. This is especially useful during the build or
testing process of applications which use libaccounts-glib, so that errors in
data files can be caught early.
</para>
<section id="validating-with-xmllint">
<title>Using <application>xmllint</application></title>
<para>
<command>xmllint</command> is part of <application>libxml2</application> and
can be used to validate an XML document against a DTD. A sample command to
validate the hypothetical XML file <filename>coolprovider.xml</filename> is:
</para>
<informalexample>
<programlisting>xmllint --noout --dtdvalid /usr/share/xml/accounts/schema/dtd/accounts-provider.dtd coolprovider.xml</programlisting>
</informalexample>
<para>
The <parameter class="option">--noout</parameter> argument suppresses
printing of the XML document, and
<parameter class="option">--dtdvalid</parameter> requests validation against
a DTD, given by the following argument. By default, the libaccounts-glib DTDs
are installed to
<filename class="directory">$(datadir)/xml/accounts/schema/dtd</filename>,
which usually expands to
<filename class="directory">/usr/share/xml/accounts/schema/dtd</filename>.
</para>
</section>
</section>
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