You are viewing a plain text version of this content. The canonical link for it is here.

Posted to dev@daffodil.apache.org by "Steve Lawrence (JIRA)" <ji...@apache.org> on 2018/10/22 17:27:00 UTC

[jira] [Created] (DAFFODIL-2013) Predicate required for when accessing optional elements in expression

Steve Lawrence created DAFFODIL-2013:
----------------------------------------

             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.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)