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Subject: Re: CA V4 Protocol Specification
From: Benjamin Franksen <[email protected]>
To: [email protected]
Date: Sun, 30 Oct 2005 13:05:17 +0100
On Wednesday 26 October 2005 00:33, Jeff Hill wrote:
> Attached is a rough cut at the EPICS V4 CA protocol specification.

Hi Jeff,

In section "IO Request Modifier Expression", tehre are two definitions 
for the non-terminal <Property Match Expression>. Which is the correct 
one?

The first one mentions a <Property Match Specification> which is nowhere 
defined.

You seem to use the meta-syntax {alt_1, ... , alt_n} to denote 
alternatives. Since this is non-standard notation, could you please add 
a short note explaining the meta-syntax or else use standard (E)BNF 
(i.e. '|' to separate alternatives)?

One comment: Instead of mixing Request Attributes with Match 
Expressions, we could encode the Request Attributes with a standard 
Property Sequence, where maxPeriod,...,propertyPath are pre-defined 
properties.

Ben

References:
CA V4 Protocol Specification Jeff Hill

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