title: XML Extended Syntax with personal params
body: <p>I see this examples:
  <a href="https://openui5.hana.ondemand.com/#docs/guide/25ab54b0113c4914999c43d07d3b71fe.html" rel="nofollow">https://openui5.hana.ondemand.com/#docs/guide/25ab54b0113c4914999c43d07d3b71fe.html</a></p>
  
  <p>I have this my formatter function:</p>
  
  <pre><code>rowVisibility: function (oRow, sGrid) {
          var oModel = new sap.ui.model.json.JSONModel();
          oModel.loadData("model/file/mapping/map.json", "", false);
          var oGridInfo = oModel.getProperty("/elements")[sGrid];
          var bVisible = true;
          _.forEach(oGridInfo.fields, function (fld) {
              if (oRow[fld] == null)
                  bVisible = false;
          });
          return bVisible;
      }
  </code></pre>
  
  <p>And in XML view I try to pass more than one param:</p>
  
  <pre><code>visible="{parts:[{path: 'model&gt;'}, {'MY_GRID_NAME'} ], formatter:'ui5bp.Formatter.rowVisibility'}"
  </code></pre>
  
  <p>but it don't work...
  How can I send sGrid param? I want create only one formatter function, not one for each sGrid!</p>
  
  <p>Example: the rowVisibility formatter function is called from 3 different context ("context_a", "context_b" and "context_c"). I want have one function called from 3 context (the behavior will different based on the context)</p>
  
  <pre><code>visible="{parts:[{path: 'model&gt;'}, {"context_a"} ], formatter:'ui5bp.Formatter.rowVisibility'}"
  
  visible="{parts:[{path: 'model&gt;'}, {"context_b"} ], formatter:'ui5bp.Formatter.rowVisibility'}"
  
  visible="{parts:[{path: 'model&gt;'}, {"context_c"} ], formatter:'ui5bp.Formatter.rowVisibility'}"
  </code></pre>
  
  <p>this is the unique function</p>
  
  <pre><code>rowVisibility: function (oRow) {
          ...
  }
  </code></pre>
  
  <p>Now instead I have 3 different functions:</p>
  
  <pre><code>rowVisibility_contextA: function (oRow) {
              ...
  }
  
  rowVisibility_contextB: function (oRow) {
              ...
  }
  
  rowVisibility_contextC: function (oRow) {
              ...
  }
  </code></pre>