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    copied!<p>I have recognized that constraints 4 and 5 can't be translated in xml schema, but I've resolved the remaining questions editing the schema structure and adding some extra constraints. Xml:</p> <pre><code>&lt;workflowManagementSystem xmlns="http://www.example.org/wfInfo" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.example.org/wfInfo wfInfo.xsd "&gt; &lt;workflows&gt; &lt;workflow name="wf1"&gt; &lt;actions&gt; &lt;action name="ac1" role="role1"&gt; &lt;/action&gt; &lt;action name="ac2" role="role2"&gt; &lt;/action&gt; &lt;action name="ac3" role="AddettoVendite" automaticallyInstantiated="true"&gt; &lt;nextAction actionName="ac1"&gt;&lt;/nextAction&gt; &lt;nextAction actionName="ac2"&gt;&lt;/nextAction&gt; &lt;/action&gt; &lt;/actions&gt; &lt;processes&gt; &lt;process startTime="2011-10-13T12:30:00Z"&gt; &lt;actionStatuses&gt; &lt;actionStatus action="ac1" actor="actor3" terminationTime="2011-10-13T12:30:00Z"&gt;&lt;/actionStatus&gt; &lt;actionStatus action="ac3" actor="actor2"&gt;&lt;/actionStatus&gt; &lt;/actionStatuses&gt; &lt;/process&gt; &lt;process startTime="2011-10-13T12:30:00Z"&gt; &lt;actionStatuses&gt; &lt;actionStatus action="ac1" actor="actor1"&gt;&lt;/actionStatus&gt; &lt;/actionStatuses&gt; &lt;/process&gt; &lt;/processes&gt; &lt;/workflow&gt; &lt;workflow name="wf2"&gt; &lt;actions&gt; &lt;action name="ac2" role="role2" automaticallyInstantiated="true"&gt; &lt;nextAction actionName="ac4"&gt;&lt;/nextAction&gt; &lt;/action&gt; &lt;action name="ac4" role="role2" automaticallyInstantiated="false"&gt; &lt;nextAction actionName="ac2"&gt;&lt;/nextAction&gt; &lt;/action&gt; &lt;action name="ac5" role="role1" automaticallyInstantiated="false"&gt; &lt;/action&gt; &lt;/actions&gt; &lt;processes&gt; &lt;/processes&gt; &lt;/workflow&gt; &lt;/workflows&gt; &lt;actors&gt; &lt;actor name="Actor1"&gt; &lt;roles&gt; &lt;role name="Role3"&gt;&lt;/role&gt; &lt;role name="Role4"&gt;&lt;/role&gt; &lt;/roles&gt; &lt;/actor&gt; &lt;actor name="Actor2"&gt; &lt;roles&gt; &lt;role name="Role1"&gt;&lt;/role&gt; &lt;/roles&gt; &lt;/actor&gt; &lt;actor name="Actor3"&gt; &lt;roles&gt; &lt;role name="Role1"&gt;&lt;/role&gt; &lt;role name="Role2"&gt;&lt;/role&gt; &lt;/roles&gt; &lt;/actor&gt; &lt;/actors&gt; &lt;/workflowManagementSystem&gt; </code></pre> <p>And the corresponding schema is:</p> <pre><code>&lt;schema xmlns="http://www.w3.org/2001/XMLSchema" targetNamespace="http://www.example.org/wfInfo" xmlns:tns="http://www.example.org/wfInfo" elementFormDefault="qualified"&gt; &lt;element name="workflowManagementSystem" type="tns:workflowManagementSystemType"&gt; &lt;!-- CONSTRAINTS --&gt; &lt;key name="workflowKey"&gt; &lt;selector xpath="tns:workflows/tns:workflow"&gt;&lt;/selector&gt; &lt;field xpath="@name"&gt;&lt;/field&gt; &lt;/key&gt; &lt;keyref name="nextProcessRef" refer="tns:workflowKey"&gt; &lt;selector xpath="tns:workflows/tns:workflow/tns:actions/tns:action/tns:nextProcess"&gt; &lt;/selector&gt; &lt;field xpath="@workflowName"&gt;&lt;/field&gt; &lt;/keyref&gt; &lt;key name="actorKey"&gt; &lt;selector xpath="tns:actors/tns:actor"&gt;&lt;/selector&gt; &lt;field xpath="@name"&gt;&lt;/field&gt; &lt;/key&gt; &lt;keyref name="actorRef" refer="tns:actorKey"&gt; &lt;selector xpath="tns:workflows/tns:workflow/tns:processes/tns:process/tns:actionStatuses/tns:actionStatus"&gt; &lt;/selector&gt; &lt;field xpath="@actor"&gt;&lt;/field&gt; &lt;/keyref&gt; &lt;/element&gt; &lt;!-- ROOT --&gt; &lt;complexType name="workflowManagementSystemType"&gt; &lt;all&gt; &lt;!-- WORKFLOWS --&gt; &lt;element name="workflows" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="workflow" type="tns:workflowType" maxOccurs="unbounded" minOccurs="0"&gt; &lt;!-- CONSTRAINTS --&gt; &lt;key name="actionKey"&gt; &lt;selector xpath="tns:actions/tns:action"&gt;&lt;/selector&gt; &lt;field xpath="@name"&gt;&lt;/field&gt; &lt;/key&gt; &lt;keyref name="nextActionRef" refer="tns:actionKey"&gt; &lt;selector xpath="tns:actions/tns:action/tns:nextAction"&gt;&lt;/selector&gt; &lt;field xpath="@actionName"&gt;&lt;/field&gt; &lt;/keyref&gt; &lt;keyref name="actionRef" refer="tns:actionKey"&gt; &lt;selector xpath="tns:processes/tns:process/tns:actionStatuses/tns:actionStatus"&gt;&lt;/selector&gt; &lt;field xpath="@action"&gt;&lt;/field&gt; &lt;/keyref&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;!-- ACTORS --&gt; &lt;element name="actors" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="actor" type="tns:actorType" maxOccurs="unbounded" minOccurs="0"&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;/all&gt; &lt;/complexType&gt; &lt;!-- WORKFLOW --&gt; &lt;complexType name="workflowType"&gt; &lt;all&gt; &lt;!-- ACTIONS --&gt; &lt;element name="actions" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="action" type="tns:actionType" maxOccurs="unbounded" minOccurs="0"&gt;&lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;!-- PROCESSES --&gt; &lt;element name="processes" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="process" type="tns:processType" maxOccurs="unbounded" minOccurs="0"&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;/all&gt; &lt;attribute name="name" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;!-- PROCESS --&gt; &lt;complexType name="processType"&gt; &lt;sequence&gt; &lt;!-- ACTIONSTATUSES --&gt; &lt;element name="actionStatuses" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="actionStatus" type="tns:actionStatusType" maxOccurs="unbounded" minOccurs="0"&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;attribute name="startTime" type="dateTime" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;!-- ACTION --&gt; &lt;complexType name="actionType"&gt; &lt;choice&gt; &lt;element name="nextAction" maxOccurs="unbounded" minOccurs="0"&gt; &lt;complexType&gt; &lt;attribute name="actionName" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;element name="nextProcess" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;attribute name="workflowName" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;/element&gt; &lt;/choice&gt; &lt;attribute name="name" type="string" use="required"&gt;&lt;/attribute&gt; &lt;attribute name="automaticallyInstantiated" type="boolean" use="required"&gt; &lt;/attribute&gt; &lt;attribute name="role" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;!-- ACTIONSTATUS --&gt; &lt;complexType name="actionStatusType"&gt; &lt;attribute name="action" type="string" use="required"&gt;&lt;/attribute&gt; &lt;attribute name="actor" type="string" use="optional"&gt;&lt;/attribute&gt; &lt;attribute name="terminationTime" type="dateTime" use="optional"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;!-- ACTOR --&gt; &lt;complexType name="actorType"&gt; &lt;sequence&gt; &lt;element name="roles" maxOccurs="1" minOccurs="1"&gt; &lt;complexType&gt; &lt;sequence&gt; &lt;element name="role" type="tns:roleType" maxOccurs="unbounded" minOccurs="1"&gt;&lt;/element&gt; &lt;/sequence&gt; &lt;/complexType&gt; &lt;!-- CONSTRAINTS --&gt; &lt;unique name="actorRoleUnique"&gt; &lt;selector xpath="tns:role"&gt;&lt;/selector&gt; &lt;field xpath="@name"&gt;&lt;/field&gt; &lt;/unique&gt; &lt;/element&gt; &lt;/sequence&gt; &lt;attribute name="name" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;complexType name="roleType"&gt; &lt;attribute name="name" type="string" use="required"&gt;&lt;/attribute&gt; &lt;/complexType&gt; &lt;/schema&gt; </code></pre>
 

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