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diff --git a/doc/devhelp/libxml2-xpathInternals.html b/doc/devhelp/libxml2-xpathInternals.html
index 863d868..6200688 100644
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@@ -663,7 +663,7 @@ void <a href="#xmlXPathDebugDumpObject">xmlXPathDebugDumpObject</a> (FILE * out
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<div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterNs"/>xmlXPathRegisterNs ()</h3><pre class="programlisting">int xmlXPathRegisterNs (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * prefix, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns_uri)<br/>
</pre><p>Register a new namespace. If @ns_uri is NULL it unregisters the namespace</p>
-<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><span class="term"><i><tt>prefix</tt></i>:</span></td><td>the namespace prefix</td></tr><tr><td><span class="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>0 in case of success, -1 in case of error</td></tr></tbody></table></div></div>
+<div class="variablelist"><table border="0"><col align="left"/><tbody><tr><td><span class="term"><i><tt>ctxt</tt></i>:</span></td><td>the XPath context</td></tr><tr><td><span class="term"><i><tt>prefix</tt></i>:</span></td><td>the namespace prefix cannot be NULL or empty string</td></tr><tr><td><span class="term"><i><tt>ns_uri</tt></i>:</span></td><td>the namespace name</td></tr><tr><td><span class="term"><i><tt>Returns</tt></i>:</span></td><td>0 in case of success, -1 in case of error</td></tr></tbody></table></div></div>
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<div class="refsect2" lang="en"><h3><a name="xmlXPathRegisterVariable"/>xmlXPathRegisterVariable ()</h3><pre class="programlisting">int xmlXPathRegisterVariable (<a href="libxml2-xpath.html#xmlXPathContextPtr">xmlXPathContextPtr</a> ctxt, <br/> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br/> <a href="libxml2-xpath.html#xmlXPathObjectPtr">xmlXPathObjectPtr</a> value)<br/>
</pre><p>Register a new variable value. If @value is NULL it unregisters the variable</p>