R_NSDEFAULT</pre><p>allow elements in no namespace</p>
<h3><a name="XML_SCHEMAS_ATTR_USE_OPTIONAL" id="XML_SCHEMAS_ATTR_USE_OPTIONAL"></a>Macro: XML_SCHEMAS_ATTR_USE_OPTIONAL</h3><pre>#define XML_SCHEMAS_ATTR_USE_OPTIONAL</pre><p>The <a href="libxml-SAX.html#attribute">attribute</a> is optional.</p>
<h3><a name="XML_SCHEMAS_ATTR_USE_PROHIBITED" id="XML_SCHEMAS_ATTR_USE_PROHIBITED"></a>Macro: XML_SCHEMAS_ATTR_USE_PROHIBITED</h3><pre>#define XML_SCHEMAS_ATTR_USE_PROHIBITED</pre><p>Used by wildcards. The <a 