private static boolean hasClass(Node param) {
        if (param.hasAttributes() && param.getAttributes().getNamedItem("class") != null) {
            return true;
        }
        return false;
    }
Use this to build a list of components for a composite item (e.g.
CompositeMetadataFilter, FetcherManager), each with their own configurations

@param compositeElementName
@param itemName
@param is
@throws TikaConfigException
@throws IOException
tika-core/src/main/java/org/apache/tika/config/ConfigBase.java