Michael Beckerle created DAFFODIL-1909:

             Summary: JAPI needs DISimple, DIComplex, DIArray, DIElement, etc 
for InfosetOutputter
                 Key: DAFFODIL-1909
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-1909
             Project: Daffodil
          Issue Type: Bug
          Components: API
    Affects Versions: 2.1.0
            Reporter: Michael Beckerle
             Fix For: 2.2.0

Our JAPI and SAPI don't allow one to drill down (into the javadoc/scaladoc) of 
the DISimple and other DINode subclasses that are passed to the 
InfosetOutputter methods.

The information on these DINode classes, including the ElementRuntimeData 
information needed by an infoset outputter needs to be on documented APIs.

This suggests we need to revisit the DINode classes and subclasses, and create 
a read-only trait that we cast up to when passing these to the InfosetOutputter 
API methods. 

This is what InfosetElement, InfosetDocument, and InfosetArray were supposed to 
be, though whether they are suitable is unclear. The DISimple/DIComplex 
distinction, for example, is very helpful when creating an InfosetOutputter. We 
may also want to provide an interface to a subset of the ERD data - as many of 
its members are internally about the needs of parsers/unparsers and not 
relevant to the external API for Daffodil.

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