Parameter syntax:

[ '[readOnly]' ]? 

If an included element or node is implicitly or explicitly selected, edit in XXE the document which is the source of the inclusion. Equivalent to menu item Edit → Reference → Edit Referenced Document.

When option [readOnly] has been specified and the referenced document needs to be opened in XXE, then this document is opened in read-only mode.

Examples:

XXE.editInclusion
XXE.editInclusion [readOnly]