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详细说明： A variety of different tools may be used to analyse, model, describe and document a business process. The workflow process definition interface defines a common interchange format, which supports the transfer of workflow process definitions between separate pr oducts. The interface also defines a formal separation between the development and run-time environments, enabling a process definition, generated by one modelling tool, to be used as input to a number of different workflow run-time products. A workflow process definition, generated by a build-time tool, is capable of interpretation in different workflow run-time products. Process definitions transferred between these products or stored in a separate repository are accessible via that common interchange format. To provide a common method to access and describe workflow definitions, a workflow process definition meta-data model has been established. This meta-data model identifies commonly used entities within a process definition. A variety of attributes describe the characteristics of this limited set of entities. Based on this model, vendor specific tools can transfer models via a common exchange format. One of the key elements of the XPDL is its extensibility to handle information used by a variety of different tools. XPDL may never be capable of supporting all additional information requirements in all tools. Based upon a limited number of entities that describe a workflow process definition (the "Minimum Meta Model"), the XPDL supports a number of differing approaches. ...展开收缩
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