What is WSDL Schema(How to define WSDL)

What is WSDL Schema(How to define WSDL):

A WSDL defines services as collections of network endpoints, or ports. In WSDL, the abstract definition of endpoints and messages is separated from their concrete network deployment or data format bindings. This allows the reuse of abstract definitions:

messages, which are abstract descriptions of the data being exchang, and

port types which are abstract collections of operation

The concrete protocol and data format specifications for a particular port type constitutes a reusable bind. A port is defined by associating a network address with a reusable binding, and a collection of ports define a service. Hence, a WSDL document uses the following elements in the definition of network services:

Types– a container for data type definitions using some type system (such as XSD).
Message– an abstract, typed definition of the data being communicated.
Operation– an abstract description of an action supported by the service.
Port Type–an abstract set of operations supported by one or more endpoints.
Binding– a concrete protocol and data format specification for a particular port type.
Port– a single endpoint defined as a combination of a binding and a network address.
Service– a collection of related endpoints.

<schema xmlns="http://www.w3.org/2000/10/XMLSchema"
        xmlns:wsdl="http://schemas.xmlsoap.org/wsdl/"
        targetNamespace="http://schemas.xmlsoap.org/wsdl/"
        elementFormDefault="qualified">
   <element name="documentation">
      <complexType mixed="true">
         <choice minOccurs="0" maxOccurs="unbounded">
            <any minOccurs="0" maxOccurs="unbounded"/>
         </choice>
         <anyAttribute/>
      </complexType>
   </element>
   <complexType name="documented" abstract="true">
      <sequence>
         <element ref="wsdl:documentation" minOccurs="0"/>
      </sequence>
   </complexType>
   <complexType name="openAtts" abstract="true">
      <annotation>
         <documentation>
         This type is extended by  component types
         to allow attributes from other namespaces to be added.
         </documentation>
      </annotation>
      <sequence>
         <element ref="wsdl:documentation" minOccurs="0"/>
      </sequence>
      <anyAttribute namespace="##other"/>
   </complexType>
   <element name="definitions" type="wsdl:definitionsType">
      <key name="message">
         <selector xpath="message"/>
         <field xpath="@name"/>
      </key>
      <key name="portType">
         <selector xpath="portType"/>
         <field xpath="@name"/>
      </key>
      <key name="binding">
         <selector xpath="binding"/>
         <field xpath="@name"/>
      </key>
      <key name="service">
         <selector xpath="service"/>
         <field xpath="@name"/>
      </key>
      <key name="import">
            <selector xpath="import"/>
            <field xpath="@namespace"/>
         </key>
      <key name="port">
         <selector xpath="service/port"/>
         <field xpath="@name"/>
      </key>
   </element>
   <complexType name="definitionsType">
      <complexContent>
         <extension base="wsdl:documented">
            <sequence>
               <element ref="wsdl:import" minOccurs="0" maxOccurs="unbounded"/>
               <element ref="wsdl:types" minOccurs="0"/>
               <element ref="wsdl:message" minOccurs="0" maxOccurs="unbounded"/>
               <element ref="wsdl:portType" minOccurs="0" maxOccurs="unbounded"/>
               <element ref="wsdl:binding" minOccurs="0" maxOccurs="unbounded"/>
               <element ref="wsdl:service" minOccurs="0" maxOccurs="unbounded"/>
               <any namespace="##other" minOccurs="0" maxOccurs="unbounded">
                  <annotation>
                     <documentation>to support extensibility elements </documentation>
                  </annotation>
               </any>
            </sequence>
            <attribute name="targetNamespace" type="uriReference" use="optional"/>
            <attribute name="name" type="NMTOKEN" use="optional"/>
         </extension>
      </complexContent>
  </complexType>
   <element name="import" type="wsdl:importType"/>
   <complexType name="importType">
      <complexContent>
   <extension base="wsdl:documented">
   <attribute name="namespace" type="uriReference" use="required"/>
      <attribute name="location" type="uriReference" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="types" type="wsdl:typesType"/>
   <complexType name="typesType">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <any namespace="##other" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
   </extension>
  </complexContent>
  </complexType>
   <element name="message" type="wsdl:messageType">
      <unique name="part">
         <selector xpath="part"/>
         <field xpath="@name"/>
      </unique>
   </element>
   <complexType name="messageType">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <element ref="wsdl:part" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="part" type="wsdl:partType"/>
   <complexType name="partType">
      <complexContent>
   <extension base="wsdl:openAtts">
   <attribute name="name" type="NMTOKEN" use="optional"/>
      <attribute name="type" type="QName" use="optional"/>
      <attribute name="element" type="QName" use="optional"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="portType" type="wsdl:portTypeType"/>
   <complexType name="portTypeType">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <element ref="wsdl:operation" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="operation" type="wsdl:operationType"/>
   <complexType name="operationType">
      <complexContent>
   <extension base="wsdl:documented">
      <choice>
         <group ref="wsdl:one-way-operation"/>
         <group ref="wsdl:request-response-operation"/>
         <group ref="wsdl:solicit-response-operation"/>
         <group ref="wsdl:notification-operation"/>
      </choice>
      <attribute name="name" type="NCName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <group name="one-way-operation">
      <sequence>
         <element ref="wsdl:input"/>
      </sequence>
   </group>
   <group name="request-response-operation">
      <sequence>
         <element ref="wsdl:input"/>
         <element ref="wsdl:output"/>
         <element ref="wsdl:fault" minOccurs="0" maxOccurs="unbounded"/>
      </sequence>
   </group>
   <group name="solicit-response-operation">
      <sequence>
         <element ref="wsdl:output"/>
         <element ref="wsdl:input"/>
         <element ref="wsdl:fault" minOccurs="0" maxOccurs="unbounded"/>
      </sequence>
   </group>
   <group name="notification-operation">
      <sequence>
         <element ref="wsdl:output"/>
      </sequence>
   </group>
   <element name="input" type="wsdl:paramType"/>
   <element name="output" type="wsdl:paramType"/>
   <element name="fault" type="wsdl:faultType"/>
   <complexType name="paramType">
      <complexContent>
   <extension base="wsdl:documented">
   <attribute name="name" type="NMTOKEN" use="optional"/>
      <attribute name="message" type="QName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <complexType name="faultType">
      <complexContent>
   <extension base="wsdl:documented">
   <attribute name="name" type="NMTOKEN" use="required"/>
      <attribute name="message" type="QName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <complexType name="startWithExtensionsType" abstract="true">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <any namespace="##other" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
   </extension>
  </complexContent>
  </complexType>
   <element name="binding" type="wsdl:bindingType"/>
   <complexType name="bindingType">
      <complexContent>
   <extension base="wsdl:startWithExtensionsType">
   <sequence>
   <element name="operation" type="wsdl:binding_operationType" minOccurs="0" maxOccurs="unbounded"/>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
      <attribute name="type" type="QName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <complexType name="binding_operationType">
      <complexContent>
   <extension base="wsdl:startWithExtensionsType">
   <sequence>
   <element name="input" type="wsdl:startWithExtensionsType" minOccurs="0"/>
      <element name="output" type="wsdl:startWithExtensionsType" minOccurs="0"/>
      <element name="fault" minOccurs="0" maxOccurs="unbounded">
         <complexType>
            <complexContent>
   <extension base="wsdl:startWithExtensionsType">
   <attribute name="name" type="NMTOKEN" use="required"/>
         </extension>
  </complexContent>
  </complexType>
      </element>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="service" type="wsdl:serviceType"/>
   <complexType name="serviceType">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <element ref="wsdl:port" minOccurs="0" maxOccurs="unbounded"/>
      <any namespace="##other" minOccurs="0"/>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
   <element name="port" type="wsdl:portType"/>
   <complexType name="portType">
      <complexContent>
   <extension base="wsdl:documented">
   <sequence>
   <any namespace="##other" minOccurs="0"/>
  </sequence>
      <attribute name="name" type="NCName" use="required"/>
      <attribute name="binding" type="QName" use="required"/>
   </extension>
  </complexContent>
  </complexType>
  <attribute name="arrayType"





 type="string"/>
</schema>

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