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2 The Language: Rationale and Fundamentals 85

Fig. 2.43 Privilege specification for a YAWL user

Table 2.10 Resource pattern support in YAWL
Pattern Group Supported Patterns
Creation patterns All except for Case Handling
Push patterns All except for Early Distribution and Late Distribution
Pull patterns All
Detour patterns All except for Redo and Pre-Do
Auto-start patterns All
Visibility patterns All
Additional resource patterns Simultaneous Execution

2.6.7 Object Role Model

This section provides a conceptual model for work distribution in a YAWL model
using the object-role notation as shown in Fig. 2.44. These aspects of the resource
perspective center around the notion of a user task, which corresponds to an indi-
vidual task in a YAWL model that will be distributed to a user for execution.
This contrasts with a system task, which is performed automatically by a software