parseStream(xmlDataStream){
        if(!isStream(xmlDataStream)) throw new Error("FXP: Invalid stream input");
        
        const orderedObjParser = new Xml2JsParser(this.options);
        orderedObjParser.entityParser.addExternalEntities(this.externalEntities);
        return orderedObjParser.parseStream(xmlDataStream);
    }
Parse XML data stream to JS object 
@param {fs.ReadableStream} xmlDataStream