<?xml version="1.0" encoding="UTF-8"?>
   <!-- $Revision: 3660 $ $Date: 2016-10-24 16:42:22 +0100 (Mon, 24 Oct 2016) $  $HeadURL: https://volute.g-vo.org/svn/trunk/projects/grid/uws/doc/UWS.xsd $ -->
   <!-- UWS schema - Paul Harrison May 2008 -->
<xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
   targetNamespace="http://www.ivoa.net/xml/UWS/v1.0" xmlns:uws="http://www.ivoa.net/xml/UWS/v1.0"
   xmlns:xlink="http://www.w3.org/1999/xlink" elementFormDefault="qualified"
   attributeFormDefault="unqualified"
   version="1.1-REC-20161024"
>
      <xs:import namespace="http://www.w3.org/1999/xlink"
      	schemaLocation="http://docs.g-vo.org/schemata/xlink.xsd"/>
      <xs:complexType name="ShortJobDescription">
         <xs:sequence>
            <xs:element name="phase" type="uws:ExecutionPhase">
               <xs:annotation>
                  <xs:documentation>
                     the execution phase - returned at
                     /{jobs}/{job-id}/phase
                  </xs:documentation>
               </xs:annotation>
            </xs:element>
          <xs:element name="runId" type="xs:string" maxOccurs="1"
            minOccurs="0" >
            <xs:annotation>
               <xs:documentation>
                  this is a client supplied identifier - the UWS system
                  does nothing other than to return it as part of the
                  description of the job
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="ownerId" type="xs:string" nillable="true" minOccurs="0" maxOccurs="1">
            <xs:annotation>
               <xs:documentation>
                  the owner (creator) of the job - this should be
                  expressed as a string that can be parsed in accordance
                  with IVOA security standards. If there was no
                  authenticated job creator then this should be set to
                  NULL.
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="creationTime" type="xs:dateTime"
            nillable="false"
         maxOccurs="1" minOccurs="0"> 
            <xs:annotation>
               <xs:documentation>
                  The instant at which the job was created.
               </xs:documentation>
            </xs:annotation>
         </xs:element>
            
         </xs:sequence>
         <xs:attribute name="id" type="uws:JobIdentifier"
            use="required"
         >
         </xs:attribute>
         <xs:attributeGroup ref="uws:reference"></xs:attributeGroup>
      </xs:complexType>
      <xs:attributeGroup name="reference">
      <xs:annotation>
         <xs:documentation>standard xlink references
         </xs:documentation>
      </xs:annotation>
      <xs:attribute ref="xlink:type" use="optional"
         default="simple" />
      <xs:attribute ref="xlink:href" use="optional" />
   </xs:attributeGroup>
   <xs:simpleType name="ExecutionPhase">
      <xs:annotation>
         <xs:documentation>
            Enumeration of possible phases of job execution
         </xs:documentation>
      </xs:annotation>
      <xs:restriction base="xs:string">
         <xs:enumeration value="PENDING">
            <xs:annotation>
               <xs:documentation>
                  The first phase a job is entered into - this is where
                  a job is being set up but no request to run has
                  occurred.
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="QUEUED">
            <xs:annotation>
               <xs:documentation>
                  A job has been accepted for execution but is waiting
                  in a queue
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="EXECUTING">
            <xs:annotation>
               <xs:documentation>A job is running</xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="COMPLETED">
            <xs:annotation>
               <xs:documentation>
                  A job has completed successfully
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="ERROR">
            <xs:annotation>
               <xs:documentation>
                  Some form of error has occurred
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="UNKNOWN">
            <xs:annotation>
               <xs:documentation>
                  The job is in an unknown state.
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="HELD">
            <xs:annotation>
               <xs:documentation>
                  The job is HELD pending execution and will not
                  automatically be executed - can occur after a
                  PHASE=RUN request has been made (cf PENDING).
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="SUSPENDED">
            <xs:annotation>
               <xs:documentation>
                  The job has been suspended by the system during
                  execution
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="ABORTED">
            <xs:annotation>
               <xs:documentation>
                  The job has been aborted, either by user request or by
                  the server because of lack or overuse of resources.
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
         <xs:enumeration value="ARCHIVED">
           <xs:annotation>
               <xs:documentation>
                  The job has been archived by the server at destruction time. An archived job
                  may have deleted the results to reclaim resources, but must have job metadata preserved.
                  This is an alternative that the server may choose in contrast to completely destroying all record of the job.
               </xs:documentation>
            </xs:annotation>
         </xs:enumeration>
      </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="JobSummary">
      <xs:annotation>
         <xs:documentation>
            The complete representation of the state of a job
         </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="jobId" type="uws:JobIdentifier" />
         <xs:element name="runId" type="xs:string" maxOccurs="1"
            minOccurs="0"
         >
            <xs:annotation>
               <xs:documentation>
                  this is a client supplied identifier - the UWS system
                  does nothing other than to return it as part of the
                  description of the job
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="ownerId" type="xs:string" nillable="true">
            <xs:annotation>
               <xs:documentation>
                  the owner (creator) of the job - this should be
                  expressed as a string that can be parsed in accordance
                  with IVOA security standards. If there was no
                  authenticated job creator then this should be set to
                  NULL.
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="phase" type="uws:ExecutionPhase">
            <xs:annotation>
               <xs:documentation>
                  the execution phase - returned at
                  /{jobs}/{job-id}/phase
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="quote" type="xs:dateTime" nillable="true"
            maxOccurs="1" minOccurs="0"
         >
            <xs:annotation>
               <xs:documentation>
                  A Quote predicts when the job is likely to complete -
                  returned at /{jobs}/{job-id}/quote "don't know" is
                  encoded by setting to the XML null value
                  xsi:nil="true"
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="creationTime" type="xs:dateTime"
            nillable="false"
         maxOccurs="1" minOccurs="0"> 
            <xs:annotation>
               <xs:documentation>
                  The instant at which the job was created.
               </xs:documentation>
               <xs:documentation>               
                Note that the version 1.1 of the specification requires that this element be present.
                It is optional only in versions 1.x of the schema for backwards compatibility.
                2.0+ versions of the schema will make this formally mandatory in an XML sense.
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="startTime" type="xs:dateTime"
            nillable="true"
         >
            <xs:annotation>
               <xs:documentation>
                  The instant at which the job started execution.
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="endTime" type="xs:dateTime"
            nillable="true"
         >
            <xs:annotation>
               <xs:documentation>
                  The instant at which the job finished execution
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="executionDuration" type="xs:int"
            nillable="false"
         >
            <xs:annotation>
               <xs:documentation>
                  The duration (in seconds) for which the job should be
                  allowed to run - a value of 0 is intended to mean
                  unlimited - returned at
                  /{jobs}/{job-id}/executionduration
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="destruction" type="xs:dateTime"
            nillable="true"
         >
            <xs:annotation>
               <xs:documentation>
                  The time at which the whole job + records + results
                  will be destroyed. returned at
                  /{jobs}/{job-id}/destruction
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element ref="uws:parameters" maxOccurs="1" minOccurs="0">
            <xs:annotation>
               <xs:documentation>
                  The parameters to the job (where appropriate) can also
                  be retrieved at /{jobs}/{job-id}/parameters
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element ref="uws:results">
            <xs:annotation>
               <xs:documentation>
                  The results for the job - can also be retrieved at
                  /{jobs}/{job-id}/results
               </xs:documentation>
            </xs:annotation>
         </xs:element>
         <xs:element name="errorSummary" type="uws:ErrorSummary"
            maxOccurs="1" minOccurs="0"
         >
         </xs:element>
         <xs:element name="jobInfo" maxOccurs="1" minOccurs="0">
            <xs:annotation>
               <xs:documentation>
                  This is arbitrary information that can be added to the
                  job description by the UWS implementation.
               </xs:documentation>
            </xs:annotation>
            <xs:complexType>
               <xs:sequence>
                  <xs:any namespace="##any" processContents="lax"
                     minOccurs="0" maxOccurs="unbounded"
                  />
               </xs:sequence>
            </xs:complexType>
         </xs:element>
      </xs:sequence>
      <xs:attribute name="version" type="uws:UWSVersion" use="optional">
         <xs:annotation>
           <xs:documentation>note that this attribute is actually required by the 1.1 specification - however remains optional in the schema
           for backwards compatibility. It will be formally required in the next major revision.</xs:documentation>
         </xs:annotation>
      </xs:attribute>
      
   </xs:complexType>
   <xs:simpleType name="JobIdentifier">
      <xs:annotation>
         <xs:documentation> The identifier for the job
         </xs:documentation>
      </xs:annotation>
      <xs:restriction base="xs:string" />
   </xs:simpleType>
   <xs:simpleType name="UWSVersion">
      <xs:annotation>
         <xs:documentation>The version of the UWS standard that the server complies with.
         </xs:documentation>
      </xs:annotation>
      <xs:restriction base="xs:string" />
   </xs:simpleType>
   <xs:element name="job" type="uws:JobSummary">
      <xs:annotation>
         <xs:documentation> This is the information that is returned
            when a GET is made for a single job resource - i.e.
            /{jobs}/{job-id}</xs:documentation>
      </xs:annotation>
   </xs:element>
   <xs:element name="jobs">
      <xs:annotation>
         <xs:documentation> The list of job references returned at
            /(jobs)</xs:documentation>
          <xs:documentation>The list presented may be affected by the current security context and may be filtered</xs:documentation>
      </xs:annotation>
      <xs:complexType>
         <xs:sequence>
            <xs:element name="jobref" type="uws:ShortJobDescription"
               maxOccurs="unbounded" minOccurs="0"
            >
            </xs:element>
         </xs:sequence>
      <xs:attribute name="version" type="uws:UWSVersion" use="optional">
         <xs:annotation>
           <xs:documentation>note that this attribute is actually required by the 1.1 specification - however remains optional in the schema
           for backwards compatibility. It will be formally required in the next major revision.</xs:documentation>
         </xs:annotation>
      </xs:attribute>
      </xs:complexType>
   </xs:element>
   <xs:complexType name="ResultReference" mixed="false">
      <xs:annotation>
         <xs:documentation> A reference to a UWS result. 
         </xs:documentation>
      </xs:annotation>
      <xs:attribute name="id" type="xs:string" use="required"></xs:attribute>
      <xs:attributeGroup ref="uws:reference"></xs:attributeGroup>
      <xs:attribute name="size" type="xs:long" use="optional" ></xs:attribute>
      <xs:attribute name="mime-type" type="xs:string" use="optional"></xs:attribute>
      <xs:anyAttribute namespace="urn:uwscustom" processContents="lax" />
   </xs:complexType>
   <xs:element name="results">
      <xs:annotation>
         <xs:documentation> The element returned for
            /{jobs}/{job-id}/results</xs:documentation>
      </xs:annotation>
      <xs:complexType>
         <xs:sequence>
            <xs:element name="result" type="uws:ResultReference"
               maxOccurs="unbounded" minOccurs="0"
            ></xs:element>
         </xs:sequence>
      </xs:complexType>
   </xs:element>
   <xs:complexType name="ErrorSummary">
      <xs:annotation>
         <xs:documentation>
            A short summary of an error - a fuller representation of the
            error may be retrieved from /{jobs}/{job-id}/error
         </xs:documentation>
      </xs:annotation>
      <xs:sequence>
         <xs:element name="message" type="xs:string"></xs:element>
      </xs:sequence>
      <xs:attribute name="type" type="uws:ErrorType" use="required">
         <xs:annotation>
            <xs:documentation>
               characterization of the type of the error
            </xs:documentation>
         </xs:annotation>
      </xs:attribute>
      <xs:attribute name="hasDetail" type="xs:boolean" use="required">
         <xs:annotation>
            <xs:documentation>if true then there is a more detailed error message available at /{jobs}/{job-id}/error</xs:documentation>
         </xs:annotation></xs:attribute>
   </xs:complexType>
   <xs:simpleType name="ErrorType">
      <xs:restriction base="xs:string">
         <xs:enumeration value="transient"></xs:enumeration>
         <xs:enumeration value="fatal"></xs:enumeration>
      </xs:restriction>
   </xs:simpleType>
   <xs:complexType name="Parameter" mixed="true">
      <xs:annotation>
         <xs:documentation> the list of input parameters to the job - if
            the job description language does not naturally have
            parameters, then this list should contain one element which
            is the content of the original POST that created the job.
         </xs:documentation>
      </xs:annotation>
      <xs:attribute name="byReference" type="xs:boolean"
         default="false"
      >
         <xs:annotation>
            <xs:documentation> if this attribute is true then the
               content of the parameter represents a URL to retrieve the
               actual parameter value.</xs:documentation>
            <xs:documentation> It is up to the implementation to decide
               if a parameter value cannot be returned directly as the
               content - the basic rule is that the representation of
               the parameter must allow the whole job element to be
               valid XML. If this cannot be achieved then the parameter
               value must be returned by reference.</xs:documentation>
         </xs:annotation>
      </xs:attribute>
      <xs:attribute name="id" type="xs:string" use="required">
         <xs:annotation>
            <xs:documentation> the identifier for the parameter
            </xs:documentation>
         </xs:annotation>
      </xs:attribute>
      <xs:attribute name="isPost" type="xs:boolean"></xs:attribute>
   </xs:complexType>
   <xs:element name="parameters">
      <xs:complexType>
         <xs:sequence>
            <xs:element name="parameter" type="uws:Parameter"
               maxOccurs="unbounded" minOccurs="0"
            ></xs:element>
         </xs:sequence>
      </xs:complexType>
   </xs:element>
</xs:schema>

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