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Section 4.10 on "Decimal-Format Declaration" states: "It is a static error for a query prolog to contain two decimal formats with the same name, or to contain two default decimal formats. [err:XQST0096]." Error XQST0096, however, refers instead to computed constructors: "It is a dynamic error the node-name of a node constructed by a computed element constructor has any of the following properties..."
*** Bug 6291 has been marked as a duplicate of this bug. ***
This is clearly a bug that needs to be fixed (it originated when merging errors into the list).
I'll create a new error code for this.