[jira] [Created] (DAFFODIL-2262) occursCountKind 'expression' should avoid separator suppression, but does not.

["Mike Beckerle (Jira)" <ji...@apache.org>]

Mike Beckerle created DAFFODIL-2262:
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             Summary: occursCountKind 'expression' should avoid separator suppression, but does not.
                 Key: DAFFODIL-2262
                 URL: https://issues.apache.org/jira/browse/DAFFODIL-2262
             Project: Daffodil
          Issue Type: Bug
          Components: Back End
    Affects Versions: 2.4.0
            Reporter: Mike Beckerle
             Fix For: 3.0.0


Reported on users mailing list.

Section 14.2.2 of the DFDL specification says this:

{color:#000000}When dfdl:occursCountKind is 'expression' the number of occurrences is given by dfdl:occursCount and exactly that many occurrences are always expected along with their separators. The dfdl:separatorSuppressionPolicy is not applicable and the implied behaviour is 'never'.{color}

The below schema has dfdl:occursCountKind="expression" and yet I am not observing the expected implied behavior of 'never'. That is, with this input:
{code:java}
header1,header2
 a,{code}
After parsing and then unparsing I get this:
{code:java}
header1,header2
 a{code}
Notice that the comma separator has been suppressed after ‘a’ but the specification says that the implied behavior is to never suppress the separator. This seems like a bug to me. Do you agree?  
{code:java}
<xs:element name="input">
     <xs:complexType>
         <xs:sequence dfdl:separator="%NL;" dfdl:separatorPosition="infix">
             <xs:element name="header">
                 <xs:complexType>
                     <xs:sequence dfdl:separator="," dfdl:separatorPosition="infix"  dfdl:separatorSuppressionPolicy="anyEmpty">
                         <xs:element name="title" maxOccurs="unbounded" type="xs:string" />
                     </xs:sequence>
                 </xs:complexType>
             </xs:element>
             <xs:element name="row" maxOccurs="unbounded">
                 <xs:complexType>
                     <xs:sequence dfdl:separator="," dfdl:separatorPosition="infix" dfdl:separatorSuppressionPolicy="anyEmpty">
                         <xs:element name="field" maxOccurs="unbounded" type="xs:string"
                             dfdl:occursCount="{ fn:count(../../header/title) }"
                             dfdl:occursCountKind="expression" />
                     </xs:sequence>
                 </xs:complexType>
             </xs:element>
         </xs:sequence>
     </xs:complexType>
 </xs:element>{code}
 



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