Michael Beckerle commented on DAFFODIL-1909:

Above a "read only trait" is discussed. Note that this probably cannot be 
read-only if InfosetInputter classes are to be writable by 3rd parties, as 
these must assemble Infoset nodes into graphs and generate infoset events from 
them that are then returned by the InfosetInputter.

> 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
>            Priority: Major
>             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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