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| Optional field in TDS |
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| leongor |
 Posted: Mon Sep 01, 2003 4:00 am Post subject: Optional field in TDS |
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Master
Joined: 13 May 2002
Posts: 264
Location: Israel
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When using TDS format I can set some compound type to be optional.
Can I set some field to be optional inside a compound type ?
_________________
Regards.
Leonid.
IBM Certified MQSeries Specialist. |
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| Craig B |
| Posted: Tue Sep 02, 2003 7:09 am Post subject: |
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Partisan
Joined: 18 Jun 2003
Posts: 316
Location: UK
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Generally TDS supports optional elements and you do not have to make settings to make use of these. The Connection tab in the MRM model allows you to specify minOccurs and maxOccurs, but when considering optional elements, these are only used for validation purposes. So if you have not enabled message validation then any element can be optional irrespective of what you have set for these values.
However, some TDS data element seperation techniques do not support optional elements. An element can only be allowed to be optional if the TDS parser can calculate that it is missing and continue parsing the message with this element missing. Therefore data element separation techniques that are tagged or delimited, the parser can calculate which elements are present and which are not, and therefore optional elements can be used. However, when dealing with Fixed Length data element separation techniques, then it is not possible to have optional elements. This is because the parser is dependent on a certain numbers of characters being present and in the correct order.
Therefore in an element was optional, the bitstream would not be of the correct length and will not be in the correct order.
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Regards
Craig |
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