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| marquies |
 Posted: Fri Apr 22, 2016 6:14 am Post subject: Ignore blank space elements in DFDL parser |
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Novice
Joined: 01 Feb 2012
Posts: 15
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Hello Everyone.
Request your inputs on my following query:
Is it possible to ignore blank value elements in DFDL parsing that are optional in nature and having data type string i.e. The DFDL parsing for optional elements with blank space should be same as parsing the optional element that is not present in the input.
Kindly 
Thank you |
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| mqjeff |
| Posted: Fri Apr 22, 2016 6:15 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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Yes, it's possible.
Lots of discussion here about all kinds of situations with modelling data using DFDL.
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| marquies |
| Posted: Fri Apr 22, 2016 6:38 am Post subject: |
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Novice
Joined: 01 Feb 2012
Posts: 15
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Thanks mqjeff.
Can you please help me on how to achieve it? i.e. how and what properties to be set..
Links or notes or any material briefing on the same will be helpful.
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| mqjeff |
| Posted: Fri Apr 22, 2016 6:38 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 17447
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I can't tell you how to do it.
It depends entirely on the structure of your message.
As I said, there's lots of discussion here about modelling data with DFDL.
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| marquies |
| Posted: Fri Apr 22, 2016 6:43 am Post subject: |
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Novice
Joined: 01 Feb 2012
Posts: 15
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Ok, no issues. I'll try to search for the same here.
Thanks. |
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| timber |
| Posted: Fri Apr 22, 2016 3:48 pm Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| Quote: |
| The DFDL parsing for optional elements with blank space should be same as parsing the optional element that is not present in the input. |
If the optional element occupies at least one byte in the input message ( even if that byte is a space character ) then according to the DFDL specification the element exists. That's a technical term, not just my opinion  .
You can tell the DFDL parser to treat the all-spaces value as a nil value. That will produce an ESQL NULL value in the message tree when the input is filled with spaces. |
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| marquies |
| Posted: Mon Apr 25, 2016 1:13 am Post subject: |
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Novice
Joined: 01 Feb 2012
Posts: 15
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Thanks Timber.
Yes, I agree with you. But I want to tell the DFDL parser to delete the optional element, if it is a blank space, instead of treating it as NULL. Is it possible? |
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| timber |
| Posted: Mon Apr 25, 2016 1:47 pm Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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| Quote: |
| I want to tell the DFDL parser to delete the optional element, if it is a blank space, instead of treating it as NULL. Is it possible? |
No. Technically, your requirement is for conditional mapping ( deleting elements with a particular value ) not parsing. I understand that this feature would be useful for you, but
a) DFDL's scope has to stop somewhere and
b) it's not actually very hard to code around this problem. |
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| manoj5007 |
| Posted: Tue Apr 26, 2016 8:37 am Post subject: |
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Acolyte
Joined: 15 May 2013
Posts: 64
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Marquies,
By default, DFDL doesn't construct optional values with null.
While parsing, the element will not be formed in the logical tree. |
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