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RE: [HST] WSDL

From: Ugo Corda <UCorda@SeeBeyond.com>
Date: Mon, 22 Jul 2002 10:28:28 -0700
Message-ID: <C513FB68F8200244B570543EF3FC653708AE35A3@MAIL1.stc.com>
To: "'Hao He'" <Hao.He@thomson.com.au>, www-ws-arch@w3.org

>2. Both interface and implementation is defined in one WSDL. 

Not entirely correct. WSDL's "import" mechanism effectively allows the
separation of interface aspects and implementation aspects in two separate
WSDL documents if so desired.

Ugo

-----Original Message-----
From: Hao He [mailto:Hao.He@thomson.com.au]
Sent: Sunday, July 21, 2002 11:20 PM
To: 'Mark Baker'; Newcomer, Eric
Cc: www-ws-arch@w3.org
Subject: [HST] WSDL 


hi,

Here is another take of "harvesting" WSDL.  Please add anything I might be
missing.

Hao


<harvest name="WSDL">

Overview
WSDL plays a descriptor role in the overall Web Services
architecture.  WSDL is static as it does not define dynamic interactions
between
Web Services.


http://www.w3.org/TR/2002/WD-wsdl12-20020709/#intro

WSDL defines
 1. abstract functionality of a service
 2. concrete binding details for SOAP 1.2, HTTP, and MIME


Namespaces

wsdl   "http://www.w3.org/2002/07/wsdl" A normative XML Schema [XML Schema:
Structures], [XML Schema: Datatypes] document for the
"http://www.w3.org/2002/07/wsdl" namespace can be found at
http://www.w3.org/2002/07/wsdl. 
soap12 "http://www.w3.org/2002/07/wsdl/soap12" Defined by WSDL 1.2: Bindings
[WSDL 1.2 Bindings]. 
http   "http://www.w3.org/2002/07/wsdl/http" Defined by WSDL 1.2: Bindings
[WSDL 1.2 Bindings]. mime "http://www.w3.org/2002/07/wsdl/mime" Defined by
WSDL 1.2: Bindings [WSDL 1.2 Bindings].

WSDL has dependencies on XML schema. 

Web Services model by WSDL

Summary: http://www.w3.org/TR/2002/WD-wsdl12-20020709/#intro

"WSDL describes Web services starting with the messages that are exchanged
between the service provider and requestor. The messages themselves are
described abstractly and then bound to a concrete network protocol and
message
format. A message consists of a collection of typed data items. An exchange
of
messages between the service provider and requestor are described as an
operation. A collection of operations is called a portType. Collections of
portTypes are grouped and called a serviceType. A service represents an
implementation of a serviceType and contains a collection of ports, where
each
port is an implementation of a portType, which includes all the concrete
details needed to interact with the service."

Components: requestor and provider
Connector: ports.
Data element: typed data item, messages

Architectural concept:

1. Messages are abstract and then bound to a concrete network protocol and
message format;
2. Operation is an exchange of message and there are only four types of
operations  (Input-Output,Output-Input, Input only, and Output only)

Architectural decisions:
1. Data types are described by XML schema.
2. Both interface and implementation is defined in one WSDL. 


WSDL bindings
http://www.w3.org/TR/2002/WD-wsdl12-20020709/#eii-binding
"A binding defines message format and protocol details for operations and
messages defined by a particular portType. There may be any number of
bindings
for a given portType."

WSDL SOAP 1.1 bindings 
http://www.w3.org/TR/2002/WD-wsdl12-bindings-20020709/#_soap-b

"1. An indication that a binding is bound to the SOAP 1.2 protocol.
 2. A way of specifying an address for a SOAP endpoint.
 3. The URI for the SOAPAction HTTP header for the HTTP binding of SOAP.
 4. A list of definitions for Headers that are transmitted as part of the
SOAP Envelope"
 
WSDL HTTP bindings

http://www.w3.org/TR/2002/WD-wsdl12-bindings-20020709/#_http

"1. An indication that a binding uses HTTP GET or POST
 2. An address for the port
 3. A relative address for each operation (relative to the base address
defined by the port) "

WSDL MIME bindings
http://www.w3.org/TR/2002/WD-wsdl12-bindings-20020709/#_mime
"1. 'multipart/related', defined in [IETF RFC 2387].
 2. 'text/xml', defined in [IETF RFC 3023].
 3. 'application/x-www-form-urlencoded', defined in Form content types
([HTML 4.01], section 17.13.4).
 4. Others (by specifying the MIME type string) "


WSDL extensibility

http://www.w3.org/TR/2002/WD-wsdl12-20020709/#language-extensibility

"WSDL has an open content model: every element in the
'http://www.w3.org/2002/07/wsdl' namespace allows arbitrary extension
attributes and extension elements as long as their names are fully qualified
and they are defined in a namespace other than
'http://www.w3.org/2002/07/wsdl'"

WSDL issues:

1. Link handling
http://mail.python.org/pipermail/xml-sig/2002-February/007184.html

2. Does not support description of dynamic interactions.

</harvest>
Received on Monday, 22 July 2002 13:29:01 GMT

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