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RFE Review. Apologies for the length of time this RFE has been held in Uncommitted Candidate status. Although this enhancement idea has only received a single vote since 2015, we wish to preserve the RFE as rounding out further elements of the DFDL specification, including testBit, remains on our long-term radar. We continue to document these areas on this page of the KC: https://www.ibm.com/support/knowledgecenter/en/SSTTDS_11.0.0/com.ibm.etools.mft.doc/df00150_.html
Status of the RFE is maintained as Uncommitted Candidate.
Due to processing by IBM, this request was reassigned to have the following updated attributes:
Brand - WebSphere
Product family - Integration
Product - IBM Integration Bus (WebSphere Message Broker) - IIB
For recording keeping, the previous attributes were:
Brand - WebSphere
Product family - Connectivity and Integration
Product - IBM Integration Bus (WebSphere Message Broker) - IIB
Having thought about it a bit more, the workaround in my previous comment does not work. Having decided it is not a 1 byte field, the target is now 2 bytes long, so testing for x'7F' will not work. We need to test for bit 9 in the two bytes field. Unfortunately, the fn:substring function cannot be used as it only takes a string data type. Therefore the implementation of this RFE is very important for the customer.
ok, there is a workaround for the length 3 case, use
discriminator test="{. le xs:hexBinary('7F')}
Yes, I agree with the workaround, which is good for now, as it has allowed me to code a discriminator for the case when there is a choice of length 1 and length 2 Tags.
However, in the very near future we will be asked to implement a length 3 tag as well in the choice, and the condition for this is : once we worked out it is not length one, i.e. bits 4 to 8 of the first byte are all on ( use the workaround for this ), then if the first bit of the 2nd byte is on, the tag is length 3. The possible combinations for this is 2 to the power of 7, and using the wrokaround would make the discriminator bigger than the rest of the xsd, that's the reason I raised this as urgent.
Thank you for raising this requirement. I understand from Steve Hanson that you have discussed the particular ISO8583 use case which you are faced with, and can use a choice with 8 options (8 possibilities, with varying values for bits 1,2 and 3 yet each of which has bits 4-8 all set on) to workaround this issue and continue to use the ISO8583 DFDL model. This said, we agree that the addition of a testBit function to DFDL would be a good enhancement for the product. Status of this RFE is updated to Uncommitted Candidate.