Pawel wrote:
Hallo group members.
I am trying to understand the following asn1 notation:
http://www.itu.int/ITU-T/asn1/database/itu-t/h/h450.1/1998/Remote-Operations-Apdus.html
I am familiar with basic notations, like: Choice, Sequence, SequenceOf,
constraints, tagging, but those braces:
ROS{InvokeId:InvokeIdSet, OPERATION:Invokable, OPERATION:Returnable}
.. and parenthesis, like:
invokeId
InvokeId(InvokeIdSet)
(CONSTRAINED BY {-- must be unambiguous -- } !
RejectProblem:invoke-duplicateInvocation),
look dangerous to me:)
Could You tell me where to look for description on these two notations?
These are parameterization, constraints and exceptions.
The first parameterizes the ROS with InvokeIdSet (first argument),
Invokable (second argument) and Returnable (third argument). They are
used in the ROS type in some places. Parameterization alters the
name space for ROS.
Constraints are things that make the type to be more restrictive
than the original type. You may choose to ignore the CONSTRAINED BY{}
notation, as it does not alters the encoding or decoding. If you don't
ignore it, then if constraint fails, the exceptions come into play:
Exceptions allow your code to detect constraint violations and invoke
some named procedures, such as invoke-duplicateInvocation. The precise
way of invoking them depends on the ASN.1 compiler in question.
--
Lev Walkin
[EMAIL PROTECTED]
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