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KIT_INC
PostPosted: Fri Mar 21, 2008 8:23 pm    Post subject: TDS or CWF Reply with quote

Knight

Joined: 25 Aug 2006
Posts: 589
I have to model a message which looks like
Header Header_data DataA DataB DataC.....DataA DataB DataC Trailer Trailer_data

There is no space between each field. The space is used here to make it easier to read.
All fileds (like Header Header_data DataA DataB DataC Trailer Trailer_data) are fixed length
DataA DataB DataC can repeat many times. I do not have the number of repeat ahead of time.

For example
HHH12345aaaaaabbbbbbbcccccccc.....* please do not use *...xxxxxxyyyyyyyzzzzzzzzTTT6789

HHH12345 HeaderHeader_data

aaaaaabbbbbbbcccccccc.....* please do not use *...xxxxxxyyyyyyyzzzzzzzz are repaeating DataA DataB abd DataC

TTT6789 TrailerTrailer_data

I like to model this using TDS. But the repeating data between the header and trailer has no tag. Can this be done or I should try using CWF. But I cannot tell the repeat count ahead of time. I am new to this. I just want your advice on which format is better or easier for this type of message.
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elvis_gn
PostPosted: Sat Mar 22, 2008 1:05 am    Post subject: Reply with quote

Padawan

Joined: 08 Oct 2004
Posts: 1905
Location: Dubai
Hi KIT_INC,

You can use TDS and use 'Fixed Length' in that too, so delimiter would not matter....rest you already know I guess.

Regards.
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kimbert
PostPosted: Sun Mar 23, 2008 4:12 pm    Post subject: Reply with quote

Jedi Council

Joined: 29 Jul 2003
Posts: 5542
Location: Southampton
You'll need TDS, and you will need to use data patterns. Try this:


Code:
Element Header   
   Local complex type DES='Tagged Fixed Length' Tag='HHH'
      HeaderData Length=5
Group Composition='choice' DES='Tagged Delimited' Tag Length=0 maxOccurs='-1'
   Group   DES='Use Data Pattern'
      Element Trailer Data Pattern='TTT.{4}'
         Local complex type DES='Tagged Fixed Length' Tag='TTT'
            TrailerData Length=5
   Element DataABC
      Local ComplexType DES='Fixed Length'
         DataA   Length='?'
         DataB   Length='?'
         DataC   Length='?'
The keys to this are:
- You need 'Use Data Pattern' to distinguish between Trailer and DataABC
- You don't want to write a data pattern to describe the whole of DataABC. That's why the choice group has DES='Tagged Delimited', not 'Use Data Pattern'

That second point may need an explanation. When a data pattern matches the bitstream, the matching portion of bitstream is extracted and used in the parsing of the element/group. So it would be no use writing a data pattern such as '[~T]' ( not 'T' ) for DataABC. That would only match a single character, and the subsequent parsing of DataABC would run out of bitstream and fail.
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