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| DFDL Modelling Fixed length optional elements |
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| vishnurajnr |
 Posted: Thu Apr 03, 2014 5:45 am Post subject: DFDL Modelling Fixed length optional elements |
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Centurion
Joined: 08 Aug 2011
Posts: 134
Location: Trivandrum
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Hi,
I would like to know the modelling in DFDL for a fixed length element which is optional. I am unable to model such element.
my message for ex: ABC123DEF456GHI (Each element is of length 3 and there are 5 elements. This structure is repeating, maxOccurs='UnBounded' and separated by CRLF)
In the above message the last two elements may not be present (Optional) in all records.
Eg:
| Code: |
ABC123DEF456GHI
ABC123DEF456GHI
ABC123DEF
ABC123DEF
ABC123DEF456GHI |
is it possible to model such a structure in DFDL? |
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| kimbert |
| Posted: Thu Apr 03, 2014 7:12 am Post subject: |
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Jedi Council
Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
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Yes, it is possible.
If you are using IIB v9 then you can set Length Kind='pattern' and use a regex to extract the data. If the regex returns a zero-length match then the field is assumed to be missing.
If you are using WMB v8 then you will have to add a DFDL assert to the each optional fields. The expression in the assert should check that the field does not start with a line break character.
_________________
Before you criticize someone, walk a mile in their shoes. That way you're a mile away, and you have their shoes too. |
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| vishnurajnr |
| Posted: Thu Apr 03, 2014 8:28 am Post subject: |
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Centurion
Joined: 08 Aug 2011
Posts: 134
Location: Trivandrum
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Thanks a lot kimbert... I m using v8 (8.0.0.3).
Will try the option given by you tomorrow. .  |
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| vishnurajnr |
| Posted: Fri Apr 04, 2014 12:25 am Post subject: |
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Centurion
Joined: 08 Aug 2011
Posts: 134
Location: Trivandrum
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Hi,
I found the optional data is present/absent based on the value of second element in the same record.
eg: ABC123DEF456GHI (all elements available since second element vale is 123)
ABC456DEF (last 2 elements not available since second element value is 456).
hence I used the occurs count kind property on the optional elements as below:
| Quote: |
| dfdl:occursCount="{if (fn:contains(/EATRANOP/EATRANOPREC/ATTRTY , '456') )then 1 else 0 }" |
.
Now the problem is the xpath expression is always taking the first record (Index always 1) and I need to have the path as /EATRANOP[1]/EATRANOPREC[currentIndex]/ATTRTY.
Similar issue if I m using the Assert-expression as well. Eg:
| Code: |
<xsd:annotation>
<xsd:appinfo source="http://www.ogf.org/dfdl/">
<dfdl:assert message="Its not a line Break" test="{fn:not(fn:starts-with(/EATRANOP/EATRANOPREC/ATSFCI , '%CR;%LF;')) }"/>
</xsd:appinfo>
</xsd:annotation> |
(ATSFCI is the optional element)
The above expression will always take the first index record only for evaluation.
Is there any way to achieve the same (to get index dynamically)? |
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