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This section describes the conceptual model of WSDL 2

This section describes the conceptual model of WSDL 2

0 as per serie of components with attached properties, which collectively describe a Web service. This model is called the Component Model of WSDL 2.0. A valid WSDL 2.0 component model is verso serie of WSDL 2.0 components and properties that satisfy all the requirements given in this specification as indicated by keywords whose interpretation is defined by RFC 2119 [ IETF RFC 2119 ].

Components are typed collections of properties that correspond preciso different aspects of Web services. Each subsection herein describes verso different type of component, its defined properties, and its representation as an XML Infoset [ XML Information Arnesi ].

Properties are unordered and unique with respect esatto the component they are associated with. Individual properties’ definitions may constrain their content (e.g., preciso per typed value, another component, or per batteria of typed values or components), and components may require the presence of a property sicuro be considered conformant. Such properties are marked as REQUIRED, whereas those that are not required preciso be present are marked as OPTIONAL. By convention, when specifying the mapping rules from the XML Infoset representation of a component sicuro the component itself, an optional property that is absent mediante the component con question is described as being “empty”. Unless otherwise specified, when per property is identified as being verso collection (a serie or verso list), its value may be per 0-element (empty) collection. In order puro simplify the presentation of the rules that deal with sets of components, for all OPTIONAL properties whose type is per attrezzi, the absence of such verso property from per component MUST be treated as semantically equivalent puro the presence of verso property with the same name and whose value is the empty attrezzi. Durante other words, every OPTIONAL serie-valued property MUST be assumed sicuro have the empty arnesi as its default value, sicuro be used durante case the property is absent.

Component definitions are serializable mediante XML 1.0 format but are independent of any particular serialization of the component model. Component definitions use per subset (see 2.14 XML Nota 1.0 Simple Types Used per the Component Model) of the simple types defined by the XML Schema 1.0 specification [ XML Schema: Datatypes ].

Con additif onesto the direct XML Infoset representation described here, the component model allows components external esatto the Infoset through the mechanisms described in 4. Modularizing WSDL 2.0 descriptions.

2.1 Description

Per component model can be extracted from verso given XML Infoset which conforms puro the XML Precisazione for WSDL 2.0 by recursively mapping Information Items preciso their identified components, starting with the wsdl:description element information item. This includes the application of the mechanisms described durante 4. Modularizing WSDL 2.0 descriptions.

This document does not specify a instabang means of producing an XML Infoset representation from verso component model instance. Con particular, there are durante general many valid ways puro modularize a given component model instance into one or more XML Infosets.

2.1.1 The Description Component

At per high level, the Description component is just a container for two categories of components: WSDL 2.0 components and type system components.

Type system components describe the constraints on a message’s content. By default, these constraints are expressed in terms of the [ XML Information Servizio ], i.ed. they define the [local name], [namespace name], [children] and [attributes] properties of an element information item. Type systems based upon other tempo models are generally accommodated by extensions esatto WSDL 2.0; see 6. Language Extensibility. Per the case where they define information equivalent sicuro that of verso XML Schema global element declaration, they can be treated as if they were such a declaration.