protected static final String getQNameAsString(QName qname) {
        String prefix = qname.getPrefix();
        if (prefix.length() > 0) {
            return prefix + ":" + qname.getLocalPart();
        } else {
            return qname.getLocalPart();
        }
    }
Content handler decorator that maps element <code>QName</code>s using
a <code>Map</code>. Not mappable elements are not forwarded.
Attributes may also be mapped (for each element different using
a <code>Map</code> for attributes), not mappable attributes are not
forwarded. The default is to not map any attributes and therefore do
not forward any of them.
tika-core/src/main/java/org/apache/tika/sax/ElementMappingContentHandler.java