It was suggested that this might be a generally useful mechanism to have for XML transformation. That is likely true; however, DFDL schemas for some data types will have parsing guided by the values created from these functions; hence, these functions must be part of DFDL's expression language function library.
(This proposal now subsumed by one on the Apache Daffodil wiki here: https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+Features+to+Support+Table-Lookup )
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