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Multiple whttp:inputSerialization

From: Elias Torres <eliast@us.ibm.com>
Date: Fri, 30 Mar 2007 13:25:43 -0400
To: public-ws-desc-comments@w3.org
Message-ID: <OF77E04E17.2AB3EC1A-ON852572AE.005E51E6-852572AE.005FBD1D@us.ibm.com>

Dear WG,

I'm currently one of the SPARQL protocol editors and we have received a
request [1] to add support for an additional input serialization and am
seeking your advice. We have done a review of the current documents [2] to
see if this is possible but we were unable to come up with a solution and
are hoping you can help us.  Ideally, we would like to know how to add
support for both application/x-www-form-urlencoded and
application/sparql-query in our query operation [3].

Additionally, my colleague Lee Feigenbaum believes we also support an XML
version of our x-www-form-urlencoded data by virtue of our WSDL defining
the input message parts via a reference to an XML schema element (<input
... element="st:query-request"/>), the query message has a message content
model of "element". Turning to:

6.3.2.1 Serialization rules for XML messages (
http://www.w3.org/TR/wsdl20-adjuncts/#_http_binding_default_rule_psf ), we
see that there are serialization rules given explicitly for
application/xml. These rules are at
http://www.w3.org/TR/wsdl20-adjuncts/#_http_operation_xml_encoding and say
that serializing a message as application/xml means that the message's
instance data is serialized as Canonical XML. Further, the instance data is
explicitly defined (
http://www.w3.org/TR/wsdl20-adjuncts/#instance_data ) to be "The internal
tree representation of an input...constrained by...the XML element
referenced in the {element declaration} property of the Interface Message
Reference component".

As I read it, this means that the inclusion of application/xml amongst our
inputSerialization allows for POSTed content that looks like:

<st:query-request>
  <st:query>SELECT * WHERE { ... } </st:query>
  <st:default-graph-uri>http://example.org/graph1</st:default-graph-uri>
  <st:default-graph-uri>http://example.org/graph2</st:default-graph-uri>
  <st:named-graph-uri>http://example.org/graph3</st:named-graph-uri>
</st:query-request>

However, we don't believe that this was our intention, furthermore, our
real interest is whether we can use multiple whttp:inputSerialization
values to add support for POSTing application/sparql-query documents.

Thanks,

Elias Torres on behalf of the DAWG.

[1]
http://lists.w3.org/Archives/Public/public-rdf-dawg-comments/2006Sep/0007
[2] http://lists.w3.org/Archives/Public/public-rdf-dawg/2007JanMar/0112
[3] http://www.w3.org/TR/rdf-sparql-protocol/sparql-protocol-query.wsdl
[4] http://www.w3.org/TR/rdf-sparql-protocol/sparql-protocol-types.xsd
Received on Friday, 30 March 2007 17:26:29 GMT

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