private static HashMap<String, Double> strictCmmlInfoToHistogram(CMMLInfo strictCmml, String tagName) {
        final NodeList elements = strictCmml.getElementsByTagName(tagName);
        return contentElementsToHistogram(elements);
    }
private static HashMap < String , Double > strictCmmlInfoToHistogram ( CMMLInfo strictCmml , String tagName ) { final NodeList elements = strictCmml . getElementsByTagName ( tagName ) ; return contentElementsToHistogram ( elements ) ; }
converts strict content math ml to a histogram for the given tagname, e.g., ci

@param strictCmml
@param tagName
@return