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<h1>22. Virtuoso Functions Guide - xml_validate_dtd</h1>
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<div id="text">
<h2>xml_validate_dtd</h2>
<div class="refpurpose">returns a string with list of errors detected by DTD validator on reading given XML document</div>
<div class="funcsynopsis">
<span class="funcdef">
<span class="function">xml_validate_dtd</span>
</span>
(<span class="paramdef">in <span class="parameter">document</span> varchar</span>,
<span class="paramdef">in <span class="parameter">parser_mode</span> integer</span>,
<span class="paramdef">in <span class="parameter">base_uri</span> varchar</span>,
<span class="paramdef">in <span class="parameter">content_encoding</span> varchar</span>,
<span class="paramdef">in <span class="parameter">content_language</span> varchar</span>,
<span class="paramdef">in <span class="parameter">dtd_validator_config</span> varchar</span>);
</div>
<div class="refsect1">
<div class="refsect1title">Description</div>
<p>
This parses the argument, which is expected to be an XML
fragment (possibly with syntax errors, violations of validity conditions etc.)
and returns a human-readable list of errors as a string.
DTD validation may be performed during any reading of XML
source in functions <span class="computeroutput">xml_tree()</span>,
<span class="computeroutput">xml_persistent()</span> or <span class="computeroutput">xper_doc()</span>, so that
an application may check XML source on the fly; severe constraint violations in
source XML will be signalled as SQL runtime errors.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Parameters</div>
<div class="refsect2">
<span class="refsect2title">document – </span>
XML or HTML document to check</div>
<div class="refsect2">
<span class="refsect2title">parser_mode – </span>
0 or 1; 0 - XML parser mode 1 - HTML parser mode</div>
<div class="refsect2">
<span class="refsect2title">base_uri – </span>
in HTML parser mode change all absolute references to relative from given base_uri (http://<host>:<port>/<path>)</div>
<div class="refsect2">
<span class="refsect2title">content_encoding – </span>
string with content encoding type of <document>; valid are 'ASCII', 'ISO', 'UTF8', 'ISO8859-1', 'LATIN-1' etc., defaults are 'UTF-8' for XML mode and 'LATIN-1' for HTML mode</div>
<div class="refsect2">
<span class="refsect2title">content_language – </span>
string with language tag of content of <document>; valid names are listed in IETF RFC 1766, default is 'x-any' (it means 'mix of words from various human languages)</div>
<div class="refsect2">
<span class="refsect2title">dtd_validator_config – </span>
configuration string of the validator, default is empty string meaning that only critical errors should be reported. See <a href="xmlschema.html#dtd_config">Configuration Options of the DTD Validator</a> for details.</div>
</div>
<div class="refsect1">
<div class="refsect1title">Return Types</div>
<p>Human readable list of errors if applicable as a varchar.</p>
</div>
<div class="refsect1">
<div class="refsect1title">Validating XML Against a DTD</div>
<a name="ex_xml_validate_dtd" />
<div class="example">
<div class="exampletitle" />
<div>
<pre class="programlisting">
declare _result varchar;
_result := xml_validate_dtd (
_text, 0, 'http://localhost.localdomain/xmlrepository', 'UTF-8', 'x-any',
'Validation=SGML FsaBadWs=IGNORE BuildStandalone=ENABLE MaxErrors=100');
if (_res = '') _res := 'NO ERRORS DETECTED';
</pre>
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<a href="fn_xml_validate_schema.html">xml_validate_schema</a>
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