Allow options in objectToDocumentXML when calling a method

* Options is optional field for objectToDocumentXML function
* Replicates `_xml` parameter functionality (sending a custom XML structure as a literal) with JSON arguments.

Author: Niche

src/client.ts

@@ -413,7 +413,7 @@ export class Client extends EventEmitter {
     } else {
       assert.ok(!style || style === 'document', 'invalid message definition for rpc style binding');
       // pass `input.$lookupType` if `input.$type` could not be found
-      message = this.wsdl.objectToDocumentXML(input.$name, args, input.targetNSAlias, input.targetNamespace, (input.$type || input.$lookupType));
+      message = this.wsdl.objectToDocumentXML(input.$name, args, input.targetNSAlias, input.targetNamespace, (input.$type || input.$lookupType), options);
     }
 
     let decodedHeaders;

src/wsdl/index.ts

@@ -567,13 +567,20 @@ export class WSDL {
    * @param {String} nsURI
    * @param {String} type
    */
-  public objectToDocumentXML(name: string, params, nsPrefix: string, nsURI?: string, type?: string) {
+  public objectToDocumentXML(name: string, params, nsPrefix: string, nsURI?: string, type?: string, options?: any) {
     // If user supplies XML already, just use that.  XML Declaration should not be present.
     if (params && params._xml) {
       return params._xml;
     }
     const args = {};
-    args[name] = params;
+    const opts = options || {};
+    if (opts.overrideBaseElement) {
+      Object.keys(params).forEach((k: string) => {
+        args[k] = params[k];
+      });
+    } else {
+      args[name] = params;
+    }
     const parameterTypeObj = type ? this.findSchemaObject(nsURI, type) : null;
     return this.objectToXML(args, null, nsPrefix, nsURI, true, null, parameterTypeObj);
   }