Re: [sca-assembly] NEW ISSUE: Interface compatibility refers to input/outputtypes which is ambiguous when using WSDL 1.1

[Mike Edwards <mike_edwards@uk.ibm.com>]

Logged as Issue 166: http://www.osoa.org/jira/browse/ASSEMBLY-116


Yours,  Mike.

Strategist - Emerging Technologies, SCA & SDO.
Co Chair OASIS SCA Assembly TC.
IBM Hursley Park, Mail Point 146, Winchester, SO21 2JN, Great Britain.
Phone & FAX: +44-1962-818014    Mobile: +44-7802-467431  
Email:  mike_edwards@uk.ibm.com

From:	Anish Karmarkar <Anish.Karmarkar@oracle.com>
To:	OASIS Assembly <sca-assembly@lists.oasis-open.org>
Date:	26/02/2009 07:46
Subject:	[sca-assembly] NEW ISSUE: Interface compatibility refers to input/output types which is ambiguous when using WSDL 1.1

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Title:  Interface compatibility refers to input/output
types which is 
ambiguous when using WSDL 1.1

Description:
In ASM60017 it states:
"compatibility between the source interface and the target interface
for 
a wire for the individual operations is defined as compatibility of the
signature, that is operation name, input types, and output types MUST be
the same."

There are two problems with this:
1) We allow different interface languages to be used in SCA, so it is 
not clear how the operation name and type comparison would be made to 
determine if they are the "same".
2) When using WSDL 1.1 interface, there are two "types" allowed:
XML 
Schema element decl or XML Schema type. How is "sameness" determined
in 
a case where the reference uses XML Schema element decl and the service
uses a XML Schema type.

Proposal:

Outline --
1) Use the WSDL 1.1 interface as the canonical interface language and 
require that "sameness" be determined after the interfaces are
mapped to 
WSDL 1.1.
2) Two interfaces A and B, where A uses XML Schema element decl and B 
uses XML Schema type are considered incompatible.

Text change --
replace ASM60017 with:
"compatibility between the source interface and the target interface
for 
a wire for the individual operations is defined as compatibility of the
signature, that is operation name, input types, and output types MUST be
the same, ***after the interfaces are mapped to WSDL 1.1 portTypes***."

add addition text as follows:
WSDL 1.1 message parts can point to XML Schema element declaration or 
XML Schema types. When determining compatibility between two WSDL 
operations, a message part that points to an XML Schema element 
declaration is considered to be incompatible with a message part that 
points to an XML Schema type.

-Anish
--

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