Schema nodes may have a number of properties and constraints set against them, valid properties are shown in the Properties Window with the node is selected.

The Keywords list provides a list of all of these along with a detailed explanation.

The properties are also displayed inline within the schema.

They can also be seen in the properties window

and tooltips

 

Inline properties can be added by setting them in the property window.

They can be edited inline within the schema or via the property window.

They can be deleted by selecting them in the diagram an pressing delete or by clearing their value in the property window.