If you consider something sitting on your desk - for example a pen - you can see it as a discrete object.  It has properties, such as Type, Colour, weight, length, age, bar code ... etc.  You could quite easily describe it to somebody else.

Using Object Modeller, you can quite easily describe it to your new web service.

Open Object Modeller and connect to your web service.  Then refer to the Help Video (button at the top of this form)