The future of Web languages seems to be the Semantic Web, and OWL is one of its activities. Now a question arises: What does OWL provide that XML and XML Schema don't? The answer is outlined below.
1. XML provides a syntax for structured documents, but doesn't define semantic constraints on the meaning of the documents.
2. XML Schema is a language for restricting the structure of XML documents.
3. RDF is a data model for objects ("resources") and relations between them; it provides simple semantics for this data model, and these data models can be
The members of the METEOR-S project are happy to announce the support for SAWSDL(Semantic Annotations for WSDL)
SAWSDL is a simple extension of WSDL using the extensibility elements. It has two basic types of annotations, the model reference and the schema mapping. The model reference annotation, the same as the WSDL-S model reference, is used to associate interfaces/port types, operations, inputs, outputs, and xml schema elements and attributes with Semantic Concepts. Model reference annotations are used by the METEOR-S framework to support the
Introduction
The Web Services Description Language (WSDL) specifies a way to describe the abstract functionalities of a service and concretely how and where to invoke it. The WSDL 2.0 specification does not include semantics in the description of Web services. Therefore, two services can have similar descriptions while meaning totally different things. Resolving this ambiguity in Web services descriptions is an important step toward automating the discovery and composition of Web services — a key productivity enabler in many domains including
Abstract
This document defines a set of extension attributes for the Web Services Description Language and XML Schema definition language that allows description of additional semantics of WSDL components. The specification defines how semantic annotation is accomplished using references to semantic models, e.g. ontologies. Semantic Annotations for WSDL and XML Schema (SAWSDL) does not specify a language for representing the semantic models. Instead it provides mechanisms by which concepts from the semantic models, typically defined outside the WSDL
The Semantic Annotations for Web Services Description Language (SAWSDL) Working Group released a Last Call Working Draft of Semantic Annotations for WSDL .
Semantic annotations can be added to Web Services Description Language (WSDL) components for use in classifying, discovering, matching, composing, and invoking Web services. Comments are welcome through 1 November. The group also released the First Public Working Draft of the companion Usage Guide .
Semantic Annotations for WSDL (SAWSDL) defines how to add semantic annotations to various parts
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