fix(core): update

ts/index.ts

@@ -9,7 +9,10 @@ export class SmartXml {
   }
 
   public createXmlFromObject(jsObject: any): string {
-    const jsToXmlParser = new plugins.fastXmlParser.j2xParser({});
+    const jsToXmlParser = new plugins.fastXmlParser.j2xParser({
+      ignoreAttributes: false,
+      attributeNamePrefix: "@_"
+    });
     const xml = jsToXmlParser.parse(jsObject);
     return xml;
   }