public Matcher descend(String namespace, String name) {
        return FAIL;
    }
Returns the XPath evaluation state that results from descending
to a child element with the given name.

@param namespace element namespace or <code>null</code>
@param name      element name
@return next XPath evaluation state
tika-core/src/main/java/org/apache/tika/sax/xpath/Matcher.java