- •1 Scope
- •1.1 General
- •2 Conformance
- •2.1 General
- •2.2 Process Modeling Conformance
- •2.2.1 BPMN Process Types
- •2.2.2 BPMN Process Elements
- •Descriptive Conformance Sub-Class
- •Analytic Conformance Sub-Class
- •Common Executable Conformance Sub-Class
- •2.2.3 Visual Appearance
- •2.2.4 Structural Conformance
- •2.2.5 Process Semantics
- •2.2.6 Attributes and Model Associations
- •2.2.7 Extended and Optional Elements
- •2.2.8 Visual Interchange
- •2.3 Process Execution Conformance
- •2.3.1 Execution Semantics
- •2.3.2 Import of Process Diagrams
- •2.4 BPEL Process Execution Conformance
- •2.5 Choreography Modeling Conformance
- •2.5.1 BPMN Choreography Types
- •2.5.2 BPMN Choreography Elements
- •2.5.3 Visual Appearance
- •2.5.4 Choreography Semantics
- •2.5.5 Visual Interchange
- •2.6 Summary of BPMN Conformance Types
- •3 Normative References
- •3.1 General
- •3.2 Normative
- •3.3 Non-Normative
- •Activity Service
- •BPEL4People
- •Business Process Definition Metamodel
- •Business Process Modeling
- •Business Transaction Protocol
- •Dublin Core Meta Data
- •ebXML BPSS
- •Open Nested Transactions
- •SOAP 1.2
- •UDDI
- •WfMC Glossary
- •Web Services Transaction
- •Workflow Patterns
- •WSBPEL
- •WS-Coordination
- •WSDL
- •WS-HumanTask
- •XML 1.0 (Second Edition)
- •XML-Namespaces
- •XML-Schema
- •XPath
- •XPDL
- •4 Terms and Definitions
- •5 Symbols
- •6 Additional Information
- •6.1 Conventions
- •6.1.1 Typographical and Linguistic Conventions and Style
- •6.1.2 Abbreviations
- •6.2 Structure of this Document
- •6.3 Acknowledgments
- •Submitting Organizations
- •Supporting Organizations
- •Special Acknowledgments
- •7 Overview
- •7.1 General
- •7.2 BPMN Scope
- •7.2.1 Uses of BPMN
- •Private (Internal) Business Processes
- •Public Processes
- •Collaborations
- •Choreographies
- •Conversations
- •Diagram Point of View
- •Understanding the Behavior of Diagrams
- •7.3 BPMN Elements
- •7.3.1 Basic BPMN Modeling Elements
- •7.3.2 Extended BPMN Modeling Elements
- •7.4 BPMN Diagram Types
- •7.5 Use of Text, Color, Size, and Lines in a Diagram
- •7.6 Flow Object Connection Rules
- •7.6.1 Sequence Flow Connections Rules
- •7.6.2 Message Flow Connection Rules
- •7.7 BPMN Extensibility
- •7.8 BPMN Example
- •8 BPMN Core Structure
- •8.1 General
- •8.2 Infrastructure
- •8.2.1 Definitions
- •8.2.2 Import
- •8.2.3 Infrastructure Package XML Schemas
- •8.3 Foundation
- •8.3.1 Base Element
- •8.3.2 Documentation
- •8.3.3 Extensibility
- •Extension
- •ExtensionDefinition
- •ExtensionAttributeDefinition
- •ExtensionAttributeValue
- •Extensibility XML Schemas
- •XML Example
- •8.3.4 External Relationships
- •8.3.5 Root Element
- •8.3.6 Foundation Package XML Schemas
- •8.4 Common Elements
- •8.4.1 Artifacts
- •Common Artifact Definitions
- •Artifact Sequence Flow Connections
- •Artifact Message Flow Connections
- •Association
- •Group
- •Category
- •Text Annotation
- •XML Schema for Artifacts
- •8.4.2 Correlation
- •CorrelationKey
- •Key-based Correlation
- •Context-based Correlation
- •XML Schema for Correlation
- •8.4.3 Error
- •8.4.4 Escalation
- •8.4.5 Events
- •8.4.6 Expressions
- •Expression
- •Formal Expression
- •8.4.7 Flow Element
- •8.4.8 Flow Elements Container
- •8.4.9 Gateways
- •8.4.10 Item Definition
- •8.4.11 Message
- •8.4.12 Resources
- •8.4.13 Sequence Flow
- •Flow Node
- •8.4.14 Common Package XML Schemas
- •8.5 Services
- •8.5.1 Interface
- •8.5.2 EndPoint
- •8.5.3 Operation
- •8.5.4 Service Package XML Schemas
- •9 Collaboration
- •9.1 General
- •9.2 Basic Collaboration Concepts
- •9.2.1 Use of BPMN Common Elements
- •9.3 Pool and Participant
- •9.3.1 Participants
- •PartnerEntity
- •PartnerRole
- •Participant Multiplicity
- •ParticipantAssociation
- •9.3.2 Lanes
- •9.4 Message Flow
- •9.4.1 Interaction Node
- •9.4.2 Message Flow Associations
- •9.5 Conversations
- •9.5.1 Conversation Node
- •9.5.2 Conversation
- •9.5.3 Sub-Conversation
- •9.5.4 Call Conversation
- •9.5.5 Global Conversation
- •9.5.6 Conversation Link
- •9.5.7 Conversation Association
- •9.5.8 Correlations
- •9.6 Process within Collaboration
- •9.7 Choreography within Collaboration
- •9.8 Collaboration Package XML Schemas
- •10 Process
- •10.1 General
- •10.2 Basic Process Concepts
- •10.2.1 Types of BPMN Processes
- •10.2.2 Use of BPMN Common Elements
- •10.3 Activities
- •Sequence Flow Connections
- •Message Flow Connections
- •10.3.1 Resource Assignment
- •Resource Role
- •Expression Assignment
- •Parameterized Resource Assignment
- •10.3.2 Performer
- •10.3.3 Tasks
- •Service Task
- •Send Task
- •Receive Task
- •User Task
- •Manual Task
- •Business Rule
- •Script Task
- •10.3.4 Human Interactions
- •Notation
- •Manual Task
- •User Task
- •Rendering of User Tasks
- •Human Performers
- •Potential Owners
- •XML Schema for Human Interactions
- •Examples
- •10.3.5 Sub-Processes
- •Embedded Sub-Process (Sub-Process)
- •Reusable Sub-Process (Call Activity)
- •Event Sub-Process
- •Transaction
- •Ad-Hoc Sub-Process
- •10.3.6 Call Activity
- •Callable Element
- •10.3.7 Global Task
- •Types of Global Task
- •10.3.8 Loop Characteristics
- •Standard Loop Characteristics
- •Multi-Instance Characteristics
- •Complex Behavior Definition
- •10.3.9 XML Schema for Activities
- •10.4 Items and Data
- •10.4.1 Data Modeling
- •Item-Aware Elements
- •Data Objects
- •DataObject
- •States
- •Data Objects representing a Collection of Data
- •Visual representations of Data Objects
- •Lifecycle and Accessibility
- •Data Stores
- •Properties
- •Lifecycle and Accessibility
- •Data Inputs and Outputs
- •Data Input
- •States
- •Data Output
- •States
- •Service Task Mapping
- •Send Task Mapping
- •Receive Task Mapping
- •User Task Mapping
- •Call Activity Mapping
- •Script Task Mapping
- •Events
- •InputSet
- •OutputSet
- •Data Associations
- •DataAssociation
- •Assignment
- •DataInputAssociation
- •DataOutputAssociation
- •Data Objects associated with a Sequence Flow
- •10.4.2 Execution Semantics for Data
- •Execution Semantics for DataAssociation
- •10.4.3 Usage of Data in XPath Expressions
- •Access to BPMN Data Objects
- •Access to BPMN Data Input and Data Output
- •Access to BPMN Properties
- •For BPMN Instance Attributes
- •10.4.4 XML Schema for Data
- •10.5 Events
- •10.5.1 Concepts
- •Data Modeling and Events
- •Common Event attributes
- •Common Catch Event attributes
- •Common Throw Event Attributes
- •Implicit Throw Event
- •10.5.2 Start Event
- •Start Event Triggers
- •Start Events for Top-level Processes
- •Start Events for Sub-Processes
- •Start Events for Event Sub-Processes
- •Attributes for Start Events
- •Sequence Flow Connections
- •Message Flow Connections
- •10.5.3 End Event
- •End Event Results
- •Sequence Flow Connections
- •Message Flow Connections
- •10.5.4 Intermediate Event
- •Intermediate Event Triggers
- •Intermediate Events in Normal Flow
- •Intermediate Events Attached to an Activity Boundary
- •Attributes for Boundary Events
- •Activity Boundary Connections
- •Sequence Flow Connections
- •Message Flow Connections
- •10.5.5 Event Definitions
- •Event Definition Metamodel
- •Cancel Event
- •Compensation Event
- •Conditional Event
- •Error Event
- •Escalation Event Definition
- •Link Event Definition
- •Message Event Definition
- •Multiple Event
- •None Event
- •Parallel Multiple Event
- •Signal Event
- •Terminate Event
- •Timer Event
- •10.5.6 Handling Events
- •Handling Start Events
- •Handling Events within normal Sequence Flow (Intermediate Events)
- •Handling Events attached to an Activity (Intermediate boundary Events and Event Sub-Processes)
- •Interrupting Event Handlers (Error, Escalation, Message, Signal, Timer, Conditional, Multiple, and Parallel Multiple)
- •Non-interrupting Event Handlers (Escalation, Message, Signal, Timer, Conditional, Multiple, and Parallel Multiple)
- •Handling End Events
- •10.5.7 Scopes
- •10.5.8 Events Package XML Schemas
- •10.6 Gateways
- •10.6.1 Sequence Flow Considerations
- •10.6.2 Exclusive Gateway
- •10.6.3 Inclusive Gateway
- •10.6.4 Parallel Gateway
- •10.6.5 Complex Gateway
- •10.6.6 Event-Based Gateway
- •10.6.7 Gateway Package XML Schemas
- •10.7 Compensation
- •10.7.1 Compensation Handler
- •10.7.2 Compensation Triggering
- •10.7.3 Relationship between Error Handling and Compensation
- •10.8 Lanes
- •10.9 Process Instances, Unmodeled Activities, and Public Processes
- •10.10 Auditing
- •10.11 Monitoring
- •10.12 Process Package XML Schemas
- •11 Choreography
- •11.1 General
- •11.2 Basic Choreography Concepts
- •11.3 Data
- •11.4 Use of BPMN Common Elements
- •11.4.1 Sequence Flow
- •11.4.2 Artifacts
- •11.5 Choreography Activities
- •11.5.1 Choreography Task
- •11.5.2 Sub-Choreography
- •The Parent Sub-Choreography (Expanded)
- •11.5.3 Call Choreography
- •11.5.4 Global Choreography Task
- •11.5.5 Looping Activities
- •11.5.6 The Sequencing of Activities
- •11.6 Events
- •11.6.1 Start Events
- •11.6.2 Intermediate Events
- •11.6.3 End Events
- •11.7 Gateways
- •11.7.1 Exclusive Gateway
- •11.7.2 Event-Based Gateway
- •11.7.3 Inclusive Gateway
- •11.7.4 Parallel Gateway
- •11.7.5 Complex Gateway
- •11.7.6 Chaining Gateways
- •11.8 Choreography within Collaboration
- •11.8.1 Participants
- •11.8.2 Swimlanes
- •Choreography Task in Combined View
- •Sub-Choreography in Combined View
- •11.9 XML Schema for Choreography
- •12 BPMN Notation and Diagrams
- •12.1 BPMN Diagram Interchange (BPMN DI)
- •12.1.1 Scope
- •12.1.2 Diagram Definition and Interchange
- •12.1.3 How to Read this Clause
- •12.2 BPMN Diagram Interchange (DI) Meta-model
- •12.2.1 Overview
- •12.2.2 Abstract Syntax
- •12.2.3 Classifier Descriptions
- •12.2.4 Complete BPMN DI XML Schema
- •12.3 Notational Depiction Library and Abstract Element Resolutions
- •12.3.1 Labels
- •12.3.2 BPMNShape
- •Markers for Activities
- •Tasks [BPMNShape]
- •Collapsed Sub-Processes [BPMNShape]
- •Expanded Sub-Processes [BPMNShape]
- •Collapsed Ad Hoc Sub-Processes [BPMNShape]
- •Expanded Ad Hoc Sub-Processes [BPMNShape]
- •Collapsed Transactions [BPMNShape]
- •Expanded Transactions [BPMNShape]
- •Collapsed Event Sub-Processes [BPMNShape]
- •Expanded Event Sub-Processes [BPMNShape]
- •Call Activities (Calling a Global Task) [BPMNShape]
- •Collapsed Call Activities (Calling a Process) [BPMNShape]
- •Expanded Call Activities (Calling a Process) [BPMNShape]
- •Data [BPMNShape]
- •Events [BPMNShape]
- •Gateways [BPMNShape]
- •Artifacts [BPMNShape]
- •Lanes [BPMNShape]
- •Pools [BPMNShape]
- •Choreography Tasks [BPMNShape]
- •Collapsed Sub-Choreographies [BPMNShape]
- •Expanded Sub-Choreographies [BPMNShape]
- •Call Choreographies (Calling a Global Choreography Task) [BPMNShape]
- •Collapsed Call Choreographies (Calling a Choreography) [BPMNShape]
- •Expanded Call Choreographies (Calling a Choreography) [BPMNShape]
- •Choreography Participant Bands [BPMNShape]
- •Conversations [BPMNShape]
- •12.3.3 BPMNEdge
- •Connecting Objects [BPMNEdge]
- •12.4 Example(s)
- •12.4.1 Depicting Content in a Sub-Process
- •Expanded Sub-Process
- •Expanded Sub-Process with Start and End Events on Border
- •Collapsed Sub-Process
- •12.4.2 Multiple Lanes and Nested Lanes
- •12.4.3 Vertical Collaboration
- •12.4.4 Conversation
- •12.4.5 Choreography
- •13 BPMN Execution Semantics
- •13.1 General
- •13.2 Process Instantiation and Termination
- •13.3 Activities
- •13.3.1 Sequence Flow Considerations
- •13.3.2 Activity
- •13.3.3 Task
- •13.3.4 Sub-Process/Call Activity
- •13.3.5 Ad-Hoc Sub-Process
- •Operational semantics
- •13.3.6 Loop Activity
- •13.3.7 Multiple Instances Activity
- •13.4 Gateways
- •13.4.1 Parallel Gateway (Fork and Join)
- •13.4.2 Exclusive Gateway (Exclusive Decision (data-based) and Exclusive Merge)
- •13.4.3 Inclusive Gateway (Inclusive Decision and Inclusive Merge)
- •13.4.4 Event-based Gateway (Exclusive Decision (event-based))
- •13.4.5 Complex Gateway (related to Complex Condition and Complex Merge)
- •13.5 Events
- •13.5.1 Start Events
- •13.5.2 Intermediate Events
- •13.5.3 Intermediate Boundary Events
- •13.5.4 Event Sub-Processes
- •Operational semantics
- •13.5.5 Compensation
- •Compensation Handler
- •Compensation Triggering
- •Relationship between Error Handling and Compensation
- •Operational Semantics
- •13.5.6 End Events
- •Process level end events
- •Sub-process level end events
- •14 Mapping BPMN Models to WS-BPEL
- •14.1 General
- •14.2 Basic BPMN-BPEL Mapping
- •14.2.1 Process
- •14.2.2 Activities
- •Common Activity Mappings
- •Task Mappings
- •Service Task
- •Receive Task
- •Send Task
- •Abstract Task
- •Service Package
- •Message
- •Interface and Operation
- •Conversations and Correlation
- •Sub-Process Mappings
- •Mapping of Event Sub-Processes
- •Activity Loop Mapping
- •Standard Loops
- •Dealing with LoopMaximum
- •Multi-Instance Activities
- •14.2.3 Events
- •Start Event Mappings
- •Message Start Events
- •Error Start Events
- •Compensation Start Events
- •Intermediate Event Mappings (Non-boundary)
- •Message Intermediate Events (Non-boundary)
- •Timer Intermediate Events (Non-boundary)
- •Compensation Intermediate Events (Non-boundary)
- •End Event Mappings
- •None End Events
- •Message End Events
- •Error End Events
- •Compensation End Events
- •Terminate End Events
- •Boundary Intermediate Events
- •Message Boundary Events
- •Error Boundary Events
- •Compensation Boundary Events
- •Multiple Boundary Events, and Boundary Events with Loops
- •14.2.4 Gateways and Sequence Flows
- •Exclusive (Data-based) Decision Pattern
- •Exclusive (Event-based) Decision Pattern
- •Inclusive Decision Pattern
- •Parallel Pattern
- •Sequence Pattern
- •Structured Loop Patterns
- •Handling Loops in Sequence Flows
- •14.2.5 Handling Data
- •Data Objects
- •Properties
- •Input and Output Sets
- •Data Associations
- •Expressions
- •Assignments
- •14.3 Extended BPMN-BPEL Mapping
- •14.3.1 End Events
- •14.3.2 Loop/Switch Combinations From a Gateway
- •14.3.3 Interleaved Loops
- •14.3.4 Infinite Loops
- •14.3.5 BPMN Elements that Span Multiple WSBPEL Sub-Elements
- •15 Exchange Formats
- •15.1 Interchanging Incomplete Models
- •15.2 Machine Readable Files
- •15.3.1 Document Structure
- •15.3.2 References within the BPMN XSD
- •15.5 XSLT Transformation between XSD and XMI
- •B.1 Scope
- •B.2 Architecture
- •B.3 Diagram Common
- •B.3.1 Overview
- •B.3.2 Abstract Syntax
- •B.3.3 Classifier Descriptions
- •B.4 Diagram Interchange
- •B.4.1 Overview
- •B.4.2 Abstract Syntax
- •B.4.3 Classifier Descriptions
Table 8.13 – Example Extension XML schema
<xsd:schema …>
…
<xsd:group name="dataRequirements"> <xsd:sequence>
<xsd:element ref="dataInput" minOccurs="0" maxOccurs="unbounded" /> <xsd:element ref="dataOutput" minOccurs="0" maxOccurs="unbounded" /> <xsd:element ref="inputSet" minOccurs="0" maxOccurs="unbounded" /> <xsd:element ref="outputSet" minOccurs="0" maxOccurs="unbounded" />
</xsd:sequence>
</xsd:group>
…
</xsd:schema>
Table 8.14 – Sample XML instance
<bpmn:definitions id=”ID_1” …>
…
<bpmn:extension mustUnderstand="true" definition="bpmn:dataRequirements"/>
…
<bpmn:task name="Retrieve Customer Record" id="ID_2"> <bpmn:dataInput name="Order Input" id="ID_3">
<bpmn:typeDefinition typeRef="bo:Order" id="ID_4"/> </bpmn:dataInput>
<bpmn:dataOutput name="Customer Record Output" id="ID_5"> <bpmn:typeDefinition typeRef="bo:CustomerRecord" id="ID_6"/>
</bpmn:dataOutput>
<bpmn:inputSet name="Inputs" id="ID_7" dataInputRefs="ID_3"/> <bpmn:outputSet name="Outputs" id="ID_8" dataOutputRefs="ID_5"/>
</bpmn:task>
…
</bpmn:definitions>
8.3.4External Relationships
It is the intention of this International Standard to cover the basic elements necessary for the construction of semantically rich and syntactically valid Process models to be used in the description of Processes, Choreographies, and business operations in multiple levels of abstraction. As the International Standard indicates, extension capabilities enable the enrichment of the information described in BPMN and supporting models to be augmented to fulfill particularities of a given usage model. These extensions’ intention is to extend the semantics of a given BPMN Artifact to provide specialization of intent or meaning.
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Process models do not exist in isolation and generally participate in larger, more complex business and system development Processes. The intention of the following element is to enable BPMN Artifacts to be integrated in these development Processes via the specification of a non-intrusive identity/relationship model between BPMN Artifacts and elements expressed in any other addressable domain model.
The ‘identity/relationship’ model is reduced to the creation of families of typed relationships that enable BPMN and non- BPMN Artifacts to be related in non intrusive manner. By simply defining ‘relationship types’ that can be associated with elements in the BPMN Artifacts and arbitrary elements in a given addressable domain model, it enables the extension and integration of BPMN models into larger system/development Processes.
It is that these extensions will enable, for example, the linkage of ‘derivation’ or ‘definition’ relationships between UML artifacts and BPMN Artifacts in novel ways. So, a UML use case could be related to a Process element in the BPMN International Standard without affecting the nature of the Artifacts themselves, but enabling different integration models that traverse specialized relationships.
Simply, the model enables the external specification of augmentation relationships between BPMN Artifacts and arbitrary relationship classification models, these external models, via traversing relationships declared in the external definition allow for linkages between BPMN elements and other structured or non-structured metadata definitions.
The UML model for this International Standard follows a simple extensible pattern as shown below; where named relationships can be established by referencing objects that exist in their given namespaces.
Figure 8.7 – External Relationship Metamodel
The Relationship element inherits the attributes and model associations of BaseElement (see Table 8.5). Table 8.15 presents the additional attributes for the Relationship element.
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Table 8.15 – Relationship attributes
Attribute Name |
Description/Usage |
|
|
type: string |
The descriptive name of the element. |
|
|
direction: RelationshipDirection {None | |
This attribute specifies the direction of the relationship. |
Forward | Backward | Both} |
|
|
|
sources: [Element [1..*] |
This association defines artifacts that are augmented by the |
|
relationship. |
|
|
targets: [Element[1..*] |
This association defines artifacts used to extend the semantics of the |
|
source element(s). |
|
|
In this manner you can, for example, create relationships between different artifacts that enable external annotations used for traceability, derivation, arbitrary classifications, etc.
An example where the ‘reengineer’ relationship is shown between elements in a Visio ™ artifact and a BPMN
Artifact.
Table 8.16 – Reengineer XML schema
<?xml version="1.0" encoding="UTF-8"?> <definitions targetNamespace=""
typeLanguage="" id="a123" expressionLanguage=""
xsi:schemaLocation="http://www.omg.org/spec/BPMN/20100524/MODEL Core-Common.xsd" xmlns="http://www.omg.org/spec/BPMN/20100524/MODEL"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:src="http://www.example.org/Processes/Old" xmlns:tgt="http://www.example.org/Processes/New">
<import importType="http://office.microsoft.com/visio" location="OrderConfirmationProcess.vsd" namespace="http://www.example.org/Processes/Old"/>
<import importType="http://www.omg.org/spec/BPMN/20100524/MODEL" location="OrderConfirmationProcess.xml" namespace="http://www.example.org/Processes/New"/>
<relationship type="reengineered" id="a234" direction="both">
<documentation>An as-is and to-be relationship. The as-is model is expressed as a Visio diagram. The re-engineered process has been split in two and is captured in BPMN 2.0 format.</documentation>
<source ref="src:OrderConfirmation"/> <target ref="tgt:OrderConfirmation_PartI"/> <target ref="tgt:OrderConfirmation_PartII"/>
</relationship> </definitions>
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8.3.5Root Element
RootElement is the abstract super class for all BPMN elements that are contained within Definitions. When contained within Definitions, these elements have their own defined life-cycle and are not deleted with the deletion of other elements. Examples of concrete RootElements include Collaboration, Process, and Choreography. Depending on their use, RootElements can be referenced by multiple other elements (i.e., they can be reused). Some RootElements MAY be contained within other elements instead of Definitions. This is done to avoid the maintenance overhead of an independent life-cycle. For example, an EventDefinition would be contained in a Process since it is used only there. In this case the EventDefinition would be dependent on the tool life-cycle of the Process.
The RootElement element inherits the attributes and model associations of BaseElement (see Table 8.5), but does not have any further attributes or model associations.
8.3.6Foundation Package XML Schemas
Table 8.17 – BaseElement XML schema
<xsd:element name="baseElement" type="tBaseElement"/> <xsd:complexType name="tBaseElement" abstract="true">
<xsd:sequence>
<xsd:element ref="documentation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="extensionElements" minOccurs="0" maxOccurs="1"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:ID" use="optional"/> <xsd:anyAttribute namespace="##other" processContents="lax"/>
</xsd:complexType>
<xsd:element name="baseElementWithMixedContent" type="tBaseElementWithMixedContent"/> <xsd:complexType name="tBaseElementWithMixedContent" abstract="true" mixed="true">
<xsd:sequence>
<xsd:element ref="documentation" minOccurs="0" maxOccurs="unbounded"/> <xsd:element ref="extensionElements" minOccurs="0" maxOccurs="1"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:ID" use="optional"/> <xsd:anyAttribute namespace="##other" processContents="lax"/>
</xsd:complexType>
<xsd:element name="extensionElements" type="tExtensionElements"/> <xsd:complexType name="tExtensionElements">
<xsd:sequence>
<xsd:any namespace="##any" processContents="lax" minOccurs="0" maxOccurs="unbounded"/> </xsd:sequence>
</xsd:complexType>
<xsd:element name="documentation" type="tDocumentation"/> <xsd:complexType name="tDocumentation" mixed="true">
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<xsd:sequence>
<xsd:any namespace="##any" processContents="lax" minOccurs="0"/>
</xsd:sequence>
<xsd:attribute name="id" type="xsd:ID" use="optional"/>
<xsd:attribute name="textFormat" type="xsd:string" default="textplain"/> </xsd:complexType>
Table 8.18 – RootElement XML schema
<xsd:element name="rootElement" type="tRootElement"/> <xsd:complexType name="tRootElement" abstract="true">
<xsd:complexContent>
<xsd:extension base="tBaseElement"/> </xsd:complexContent>
</xsd:complexType
Table 8.19 – Relationship XML schema
<xsd:element name="relationship" type="tRelationship"/> <xsd:complexType name="tRelationship">
<xsd:complexContent>
<xsd:extension base="tBaseElement"> <xsd:sequence>
<xsd:element name="source" type="xsd:QName" minOccurs="1" maxOccurs="unbounded"/> <xsd:element name="target" type="xsd:QName" minOccurs="1" maxOccurs="unbounded"/>
</xsd:sequence>
<xsd:attribute name="type" type="xsd:string" use="required"/> <xsd:attribute name="direction" type="tRelationshipDirection"/>
</xsd:extension>
</xsd:complexContent>
</xsd:complexType>
<xsd:simpleType name="tRelationshipDirection"> <xsd:restriction base="xsd:string">
<xsd:enumeration value="None"/> <xsd:enumeration value="Forward"/> <xsd:enumeration value="Backward"/> <xsd:enumeration value="Both"/>
</xsd:restriction>
</xsd:simpleType>
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