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https://issues.apache.org/jira/browse/DAFFODIL-2186?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16928621#comment-16928621
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Olabusayo Kilo commented on DAFFODIL-2186:
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Proposal to solve this is here
[https://cwiki.apache.org/confluence/display/DAFFODIL/Proposal%3A+User+Defined+Functions]
> 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
> Assignee: Olabusayo Kilo
> Priority: Major
> 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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