[DAFFODIL-1189] DPath: implement fn:exactly-one

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Component/s: DFDL Language
• Assignee: Unassigned
• Reporter: Taylor Wise
• Created: 08/Dec/14 13:20
• Updated: 13/Jan/21 20:55
• Resolved: 13/Jan/21 20:44

Description

Implement fn:exactly-one.

There are two phases to this. One behaves like

 if (fn:exists(x)) then x else error 

. This is the version that we need first.

Later, once DFDL-1118 is implemented this needs to be revisited. However, that's a separate issue. Not even creating a ticket for it. This task should be part of the implementation work for DFDL-1118.