[DFDL-WG] unordered sequence with constrained occurrences
Garriss Jr., James P.
jgarriss at mitre.org
Tue Mar 5 13:10:35 EST 2013
Can this be done with one or more asserts?
From: Garriss Jr., James P.
Sent: Tuesday, March 05, 2013 8:43 AM
To: dfdl-wg at ogf.org
Subject: unordered sequence with constrained occurrences
Suppose text data has 3 constructs: a, b, and c.
* a must occur 1 time
* b can occur 0 or 1 time
* c can occur any number of times, 0 or more
These 3 constructs can appear in any order.
So these are valid inputs:
abc
a
bcccca
But these are not:
ccbcc
abbc
abcabc
Can data like this be modeled with DFDL?
The unordered sequence can be modeled with a data array, like this:
Array (0 to unbounded)
Sequence
a (0 to 1)
b (0 to 1)
c (0 to 1)
/Sequence
/Array
But I don't know how to constrain the total number of occurrences.
Appreciate any ideas!
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