You cannot dynamically set maxOccurs--that has to be either a static
number or "unbounded". This is a restriction of XML Schema that DFDL is
based off of.
But Daffodil does support what you're trying to do . First, you'll want
to set maxOccurs="unbounded" (since we don't know how many parameter
instances there might be). Bbut then we can use the
dfdl:occursCountKind="expression" and dfdl:occursCount properties to
evaluate an expression at parse time to set the number of occurrences to
the value of the third field. For example:
...
<xs:element name="field3" type="xs:int" ... />
<xs:element name="parameters" type="..." maxOccurs="unbounded"
dfdl:occursCountKind="expression"
dfdl:occursCount="{ ../field3 }" ... />
...
So we parse field3 to an integer and then use that value in an
expression to determine the number of occurrences of the parameters array.
On 7/21/21 8:04 AM, Horvath, Attila J CTR (USA) wrote:
> ALCON - see attached PDF version of this message
>
> I have a Character Separated Values [CSV] ASCII input file where:
>
> - fields are ASCII STX character [0x02] separated
>
> - variable number of fields per below
>
> - records are ASCII DC4 character [0x14] terminated
>
> - file is ASCII EOT character [0x04] terminated
>
> In following sample excerpt, highlighted in YELLOW is last record of data
> file.
>
> 3rd field [31 30] specifies 10 fields to follow each STX [0x02] delimited,
>
> followed by record and file terminators [0x14 0x04] respectively...
>
> Is it possible to read the 3rd field ['10'], save it via [*_dfdl:lengthKind_*
> and/or *_dfdl:defineVariable_*] as "NUM_FIELDS" and pass that value to
> 'maxOccurs' attribute on per record basis?
>
> EG:...
>
> <xs:element name="parameters" maxOccurs=NUM_FIELDS minOccurs="1">
>
> ...
>
> </xs:element>
>
> Thx in advance
>
> Attila
>
