While you are annotating an XML schema in the IBM XML Schema Mapping Designer, you can specify values for the properties that are associated with each map link.
Requirement: An annotated XML schema must be open in the IBM XML Schema Mapping Designer, with one or more map links displayed.
To specify values for the properties of a map link:
A selected map link has a handle at the right perimeter of the Source XML Schema pane and another handle at the right end of the link where it connects to a column.
Annotating XML Schemas | IBM XML Schema Mapping Designer | Keyboard Shortcuts