eBiss 3 can map structures into variables!
For example, if you set a selection in a rule that selects a typed value (incl. whole trees), you can save it as $$VariableName on the right-hand side. Later on, you can access this structure directly in the entire document and carry out further work with it.
For example, save the entire folder document:
Rule: /Orders => $$doc
Call it later in a mapping:
or better and faster with the XVar function:
Rule: XVar (‘ doc’)/@SupplierGLN
or the total of the item quantities stored in the document:
Rule: sum (XVar (‘ doc’)/Items/@Quantity)
For more information, see the variables help.