In this tutorial we show how the complexity of the control flow can be reduced by using worklets and exlets in YAWL specifications.
Welcome to the YAWL User Group website yaug.org! We would like to concentrate the know-how of all YAWL users and serve as a plattform for suggestions, discussions and collaboration. YAWL is an open source BPM/Workflow system being developed by the YAWL Foundation.
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YAWL 4.0 is now available here for download. One of the most prominent new features is a worklet and exlet editor. Worklets allow for so-called ad hoc workflows. Workflow behaviour can be extended while a case is running. Exlets are a concept for exception handling. Everything is described in the new YAWL User Manual.
Try the new version and let us know what you think.
YAWL 4.0 features an integrated worklet editor that makes the work of a previous tutorial much easier. Our goal here is to use the worklet service to create a subworkflow that can be reused in many specifications. In order to demonstrate this, we will create two YAWL specifications. MainProcess.yawl is the specification for the workflow that will call the subworkflow. DisplayValue.yawl is the one that will be called. You can find the specs attached below. Let us now start step by step.
What is the most frequent requirement for a workflow system? Is it BPMN conformance?
YAWL is not BPMN. We would like to make YAWL better than BPMN. Having fewer constructs with a similar expressivity is certainly an advantage. Using colours instead of swimlanes like in the attached figure certainly saves a lot of space.
We would like to get your opinion on this topic. Just post on this forum or send me an email.
The update functionality of the control panel and the editor is broken due to the move of YAWL from Sourceforge to Github. This affects YAWL version 3.x.
The fix of this problem will come with YAWL 4.0 which will be released soon. Everyone should update to this new version as soon as it is available.
Organisational data, user names and passwords are at the centre of the resource perspective of workflow management systems. YAWL has its own organisational model, and in the standard configuration, organisational data are entered via the control centre.
YAWL can create process logs in XES format by simply selecting a specification in the control panel and clicking on "download log".
Unfortunately, the log that is exported there does not contain the log predicates that can be entered in YAWL specifications. These logs can only be extracted using the YAWL API. There is now a Java Command Line Program that extracts these log attributes.