[oslc-core] Core Specification Version 2.0 Query Syntax: oslc.select/oslc.properties BNF

[Steven B Pitschke]

Hi Arthur,

I am working on a Lyo implementation of the server side of query 
semantics.  All three
grammars can be implementation in ANTLR and I have done so.

My point is that if someone specified

        oslc.select=dcterms:name,*

the '*' sub-term is inclusive of 'dcterms:name', so 'dcterms:name' is 
redundant.   believe it would
be simpler to understand  if the above were illegal and only

        oslc.select=*

was allowed.

My second point is that a 

        oslc.properties=*{dcterms:name,cm:comment}

is the same as

        oslc.select=dcterms:name,cm:comment

so again is somewhat redudant.  I guess

        oslc.select=*{dcterms:name,cm:comment}

seems to add some further semantics, but I am not sure the added 
complexity add much value.

Regards,

Steve Pitschke
Development Lead for IBM Rational Connector for SAP Solution Manager




From:   Arthur Ryman <ryman at ca.ibm.com>
To:     Steven B Pitschke/Lexington/IBM at IBMUS
Cc:     oslc-core at open-services.net, oslc-core-bounces at open-services.net
Date:   07/10/2012 07:57 AM
Subject:        Re: [oslc-core] Core Specification Version 2.0 Query 
Syntax: oslc.select/oslc.properties BNF



Steven,

I am not following your suggested change completely. However, the current 
grammar works with ANTLR [1] and that is a useful characteristic. Please 
test any changes with ANTLR.

[1] http://open-services.net/bin/view/Main/MetricsOslcQueryImplementation

Regards, 
___________________________________________________________________________ 


Arthur Ryman 

DE, Chief Architect, Reporting &
Portfolio Strategy and Management
IBM Software, Rational 

Toronto Lab | +1-905-413-3077 (office) | +1-416-939-5063 (mobile) 





From:
Steven B Pitschke <pitschke at us.ibm.com>
To:
oslc-core at open-services.net
Date:
06/29/2012 01:28 PM
Subject:
[oslc-core] Core Specification Version 2.0 Query Syntax: 
oslc.select/oslc.properties BNF
Sent by:
oslc-core-bounces at open-services.net



The core query specification 

        http://open-services.net/bin/view/Main/OSLCCoreSpecQuery 

gives a BNFfor select and properties of 

        oslc_select                :== "oslc.select=" properties 
        properties                :== property ( "," property )* 
        property                :== identifier | wildcard | nest_prop 
        nested_prop                := ( identifier | wildcard) "{" 
properties "}" 

which would allow the redundant "dcterms:name, *".  I would think the BNF 
would more properly be 

        oslc_select   ::= "oslc.select=" property_list 
        property_list ::= wildcard | properties 
        properties    ::= property ("," property)* 
        property      ::= identifier | nested_prop 
        nested_prop   ::= (identifier | wildcard) "{" property_list "}" 

or 

        oslc_select   ::= "oslc.select=" property_list 
        property_list ::= wildcard | properties 
        properties    ::= property ("," property)* 
        property      ::= identifier | nested_prop 
        nested_prop   ::= identifier "{" property_list "}" 

the difference between the two being whether or not 
"*{dcterms:comment,cm:comment}" 
makes sense. 

Regards, 

Steve Pitschke
Senior Software Engineer and Architect 
Rational Software, IBM_______________________________________________
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