Update service in Windchill Connector for Thingworx

Hello all, I am exploring Thingworx these days. I need help with Update service. I do not see any documentation on how to use it. I just hover over it to know little more about its usage in Thingworx Composer. However that's not enough.

I am having hard time finding out how to update an object in Windchill. What syntax would work for modification parameter. Any pointers..

var params = {

  modification: undefined /* STRING */,

  dataShape: undefined /* DATASHAPENAME */,

  objects: undefined /* INFOTABLE */

};

// result: INFOTABLE dataShape: "undefined"

var result = me.Update(params);

Please help.

thanks.