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| DFDL modeling elements with unknown names |
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Message
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| rekarm01 |
 Posted: Fri Apr 13, 2018 5:38 pm Post subject: DFDL modeling elements with unknown names |
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Grand Master
Joined: 25 Jun 2008
Posts: 1415
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Given a (simplified) sample message like:
| Code: |
Prop1=Val1
Prop2=Val2
Prop3=Val3
... |
To preserve backwards compatibility with existing usage, I want the parsed tree structure to look something like:
| Code: |
<Prop1>Val1</Prop1>
<Prop2>Val2</Prop2>
<Prop3>Val3</Prop3>
... |
except that the names of the elements aren't necessarily known in advance, so I can't enumerate them in the DFDL schema. I tried using regular expressions with dfdl:lengthPattern, something like:
| Code: |
| <xsd:element dfdl:lengthKind="pattern" dfdl:lengthPattern="[A-Z][A-Za-z0-9]+" name="???" ... > |
but that seems more useful for setting the value of an element, rather than the name. I also tried using dfdl:initiator to set the value for a dfdl variable, something like:
| Code: |
| <xsd:element dfdl:initiator="[A-Z][A-Za-z0-9]+" name="{$elemName}" ... > |
but couldn't quite figure out how to both set and use a dfdl variable within the scope of the same element.
How can DFDL model elements like this, where the names of the elements are provided in the data? |
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| timber |
| Posted: Sat Apr 14, 2018 2:55 am Post subject: |
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Grand Master
Joined: 25 Aug 2015
Posts: 1292
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One of the rules of DFDL is that the element names must be known in advance. Supporting XML Schema wildcards (xs:any, abstract types etc) would have been extremely difficult to specify properly, and would be used very rarely.
I would model your format like this:
| Code: |
message
sequence delimiter=%NL;
field maxOccurs=unbounded
sequence delimiter='='
fieldName
fieldValue |
Not exactly the XML structure that you were aiming for, but it would be simple to restructure the message tree if that matters. |
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| rekarm01 |
| Posted: Sat Apr 14, 2018 11:28 am Post subject: |
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Grand Master
Joined: 25 Jun 2008
Posts: 1415
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| timber wrote: |
| One of the rules of DFDL is that the element names must be known in advance. |
I suspected that, but I wasn't sure.
| timber wrote: |
| I would model your format like this ... Not exactly the XML structure that you were aiming for, ... |
Not exactly, no, but it seems like the best available option. Thanks for your help. |
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