| gworkflowdl_2_0.xsd | ||||||
| DETAILS: DOCUMENTATION | | FRAMES | NO FRAMES | ||||||
| Element Summary | |
| description | Human-readable description of the element. |
| inputPlace | Specifies an input edge which connects the transition with a specific input place. |
| outputPlace | Specifies an output edge which connects the transition with a specific output place. |
| owl | URI to external OWL description of the element. |
| property | Generic property. |
| readPlace | Specifies a read edge which connects the transition with a specific read place. |
| workflow | Representation of a workflow by means of a High-level Petri net, mainly composed of places and transitions. |
| workflow.place | A place is a placeholder for tokens that represent the data and the state of the workflow. |
| workflow.place.token | A token represents state information, such as true/false (control token) or arbitrary XML (data token). |
| workflow.place.token.data | The data element can hold one single child element with arbitrary XML representing data (e.g., SOAP parameters) or references to data (e.g., filenames). |
| workflow.place.tokenClass | Description of the class of tokens hold by a place. |
| workflow.transition | The ocurrence of a transition alters the state of the Petri net. |
| workflow.transition.operation | The element "operation" links transitions with (external) operations. |
| writePlace | Specifies a write edge which connects the transition with a specific write place. |
| Complex Type Summary | |
| placeRef | Reference to a place within the same GWorkflowDL document. |
By default, local element declarations belong to this schema's target namespace.
By default, local attribute declarations have no namespace.
XML Schema of the Petrinet-based Generic Workflow Description Language (GWorfklowDL).
Copyright 2009 Fraunhofer Gesellschaft, Munich, Germany, for its Fraunhofer Institute for Computer
Architecture and Software Technology (FIRST), Berlin, Germany
All rights reserved. This file is licensed under the terms of the
Fraunhofer FIRST license
Written by Andreas Hoheisel, Hans-Werner Pohl, and Tilman
Linden; Fraunhofer FIRST.
Version: $Id: gworkflowdl_2_0.xsd 1348 2010-02-04 10:22:12Z andreas.hoheisel@first.fraunhofer.de $
This XML Schema specifies a language for describing the data and control flow of workflows based on the Petri net standard ISO/IEC 15909-1: "High-level Petri nets - Part 1: Concepts, definitions and graphical notation". Within the GWorkflowDL, the root element workflow represents a High-Level Petri Net (HLPN), which is composed of a set of places visualized by circles, transitions visualized by squares, and flow relations represented by arcs from places to transitions or from transitions to places. In addition, places can be labeled with a partial capacity restriction specifying the maximum number of tokens hold by a place. In contrast to ordinary P/T Petri Nets, the tokens of HLPNs are distinguishable and can be used to model high-level values, such as real input/output data, references to data (e.g., filenames or URLs), and boolean values representing side-effects. The distribution of tokens on places is called marking and represents the state of the distributed system. When an enabled transition occurs (fires), then one input token is consumed from each input place (e.g., holding input data) and one new output token is put on each output place (e.g., holding output data).
This XML namespace mainly comprises the sematics and syntax for describing worklow structures. The declaration of specific operations and data may be done by means of additional namespaces, such as http://www.gridworkflow.org/gworkflowdl/operationclass.
Example workflow:
<workflow xmlns="http://www.gridworkflow.org/gworkflowdl" ID="No_ID">
<description>simple workflow</description>
<place ID="begin">
<token><control>true</control></token>
</place>
<place ID="end"/>
<transition ID="t">
<inputPlace placeID="begin"/>
<outputPlace placeID="end"/>
</transition>
</workflow>
| gworkflowdl_2_0.xsd | ||||||
| DETAILS: DOCUMENTATION | | FRAMES | NO FRAMES | ||||||