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Report from the ATF ATF team. 2 What is an Attribute? Think of it this way: –Attributes define a pattern or short hand for messages that are supported.

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Presentation on theme: "Report from the ATF ATF team. 2 What is an Attribute? Think of it this way: –Attributes define a pattern or short hand for messages that are supported."— Presentation transcript:

1 Report from the ATF ATF team

2 2 What is an Attribute? Think of it this way: –Attributes define a pattern or short hand for messages that are supported by a service –Attribute MAY be used as a constraint on the values for input and output messages on certain operations –An Attribute MAY be viewed as an element of a logical document associated with the service Some applications of Attributes: –Represent properties/values associated with the service –Represent values of a services metadata –Represent the manageable properties of a service –Represent values of a services state –Other things that sgg cannot currently imagine

3 3 What is Needed? A single standard for modeling attributes at the interface level A simple base mechanism to get/set values associated with attributes –But, doing this in a way that supports more sophisticated mechanisms Get/Set subsets of all the attributes for a service in a single operation Query mechanisms on the values of multiple attributes The exact set of requirements are in the report Other domains (eg OASIS WSDM, GGF) MAY define interface(s)/operation(s) that provide more sophisticated access to the values represented by the attribute

4 4 Why is this Needed? Several vendors/users are passionate about this work Several groups (eg GGF, WSDM) have independently defined approaches in this space, therefore impetus to standardize Standardizing this in WSDL increases probability of interoperability on the definition and the simple operations –The aforementioned groups have stated preference that this concept be standardized in WSDL Provides standard base upon which others can define more sophisticated operations over attributes

5 5 ATF Proposal As with the last proposal (in Raleigh) –Model attribute as a first class component child of interface –Sibling of operation What is different? –The base binding mechanism –Simpler, message pattern exchange approach

6 6 As with last time, Define Attribute Component on the Interface access= read | write | read-write? > * *

7 7 Bindings define how to do simple get/set on the attributes value Define the way that bindings inform the consumers of the WSDL the message sets for get/set This is analogous to the way that bindings inform WSDL consumers how to interpret operations All bindings MUST define how they treat attributes that appear in the interface

8 8 SOAP/HTTP Binding Get request Get Response current value current value Possible fault messages: –UnknownAttribute –WriteOnlyAttribute

9 9 SOAP/HTTP Binding Set request new value new value Set Response –Currently (none) –We are considering that there should be a formal ack and the possibility of soap:fault messages –Lack of soap:fault message in response body to be interpreted as success

10 10 HTTP Binding Get (use http get verb) url?attribute-ns= "xsd:anyURI"&attribute-localname="localName" Value of the attribute (or error message) appears in body of http response Set (use http post verb) –Body of the post contains new value: new value new value Set Response –Currently (none) –We are considering that there should be a formal ack and the possibility of fault messages and/or appropriate HTTP codes –Interpret the http header to determine success


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