Michael Beckerle created DAFFODIL-2186:
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Summary: User defined functions for DPath expressions
Key: DAFFODIL-2186
URL: https://issues.apache.org/jira/browse/DAFFODIL-2186
Project: Daffodil
Issue Type: New Feature
Components: Back End, Front End
Affects Versions: 2.4.0
Reporter: Michael Beckerle
Fix For: 2.5.0
Some things cannot be reasonably expressed in DFDL's DPath expression language.
A good example of this is the abililty to convert between elevation measured in
height above geoid (aka elevation above mean sea level or MSL), and
height-above-elipsoid or HAE. This requires a table of numbers and
interpolation. Nevertheless a DFDL schema needs to convert units of measure and
it is very convenient to have the output of a DFDL parse to be normalized into
a desired unit of measure.
The ability to define a function in a separate jar library, and call it from a
DPath expression, having registered it somehow so Daffodil can find it, is what
I'm calling a user-defined function.
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