Steve Lawrence created DAFFODIL-2013:
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Summary: Predicate required for when accessing optional elements
in expression
Key: DAFFODIL-2013
URL: https://issues.apache.org/jira/browse/DAFFODIL-2013
Project: Daffodil
Issue Type: Bug
Components: Front End
Affects Versions: 2.2.0
Reporter: Steve Lawrence
Behind the scenes we treat optional elements (e.g. minOccurs="1"
dfdl:lengthKind="implicit"), as arrays that should just always have either zero
or one elements. This means that when an expression attempts to access this
element, a predicate of [1] is required. Otherwise you get an error about
"Query-style paths not supported". We should have logic to treat optional
elements special so that the predicate is not mandatory.
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