Invited Papers.- Challenges and Opportunities for Formal Specifications in Service Oriented Architectures.- Modeling Interactions between Biochemical Reactions.- Transaction Calculus.- Stratifying Winning Positions in Parity Games.- On the Physical Basics of Information Flow.- Regular Papers.- Faster Unfolding of General Petri Nets Based on Token Flows.- Decomposition Theorems for Bounded Persistent Petri Nets.- Compositional Specification of Web Services Via Behavioural Equivalence of Nets: A Case Study.- Modeling and Analysis of Security Protocols Using Role Based Specifications and Petri Nets.- A Symbolic Algorithm for the Synthesis of Bounded Petri Nets.- Synthesis of Nets with Step Firing Policies.- Modelling and Analysis of the INVITE Transaction of the Session Initiation Protocol Using Coloured Petri Nets.- Modelling and Initial Validation of the DYMO Routing Protocol for Mobile Ad-Hoc Networks.- Formal Specification and Validation of Secure Connection Establishment in a Generic Access Network Scenario.- Parametric Language Analysis of the Class of Stop-and-Wait Protocols.- Hierarchical Set Decision Diagrams and Automatic Saturation.- Performance Evaluation of Workflows Using Continuous Petri Nets with Interval Firing Speeds.- Modelling Concurrency with Quotient Monoids.- Labeled Step Sequences in Petri Nets.- MC-SOG: An LTL Model Checker Based on Symbolic Observation Graphs.- Symbolic State Space of Stopwatch Petri Nets with Discrete-Time Semantics (Theory Paper).- A Practical Approach to Verification of Mobile Systems Using Net Unfoldings.- Cooperative Arrival Management in Air Traffic Control - A Coloured Petri Net Model of Sequence Planning.- Process Discovery Using Integer Linear Programming.- Tool Papers.- Synthesis of Petri Nets from Scenarios with VipTool.- A Monitoring Toolset for Paose.- Animated Graphical User Interface Generator Framework for Input-Output Place-Transition Petri Net Models.- HYPENS: A Matlab Tool for Timed Discrete, Continuous and Hybrid Petri Nets.