We investigate Petri nets with data, an extension of plain Petri nets where tokens carry values from an infinite data domain, and executability of transitions is conditioned by equalities between data values. We provide a decision procedure for the bi-reachability problem: given a Petri net and its two configurations, we ask if each of the configurations is reachable from the other. This pushes forward the decidability borderline, as the bi-reachability problem subsumes the coverability problem (which is known to be decidable) and is subsumed by the reachability problem (whose decidability status is unknown).
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iOS 8 提供的应用间和应用跟系统的功能交互特性。
Source: iOS 8 Extensions: Apple’s Plan for a Powerful App Ecosystem
- Today (iOS and OS X): widgets for the Today view of Notification Center
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Source: iOS 8 Extensions: Apple’s Plan for a Powerful App Ecosystem
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