Ptolemy II was developed by the members of the Ptolemy project at UC Berkley and was begun in 1997. Ptolemy-II is platform for a visual modeling tool written in Java. It was begun in at UC Berkley. Although not originally intended for scientific workflows, it provides a mature platform for building and executing workflows, and supports multiple models of computation. Several recent SDM efforts in including \[altintas02a\], \[ludaesher03\], \[mladen03\], and \[altintas03\] have extended the PtolemyII platform to allow for the draganddrop creation of scientific workflows from libraries of actors. The Ptolemy actor is often a wrapper around a call to web service or grid service. Ptolemy leverages an XMLmeta language called [MoML] to produce a workflow document describing the relationships of the entities, properties, and ports in a workflow. While the MoML description deals with the connections between actors on an very abstract level, Ptolemy-II offers several execution strategies (called "Domains") to actually interpretate the abstract Model as a Workflow. Among these domains are DE - Discrete Events, CT - Continuous Time, SDF - Synchronous Data Flow, PN - Process Network, ... (see {link:Ptolemy-II Domains|http://ptolemy.eecs.berkeley.edu/papers/03/ptIIDesignDomains/ptIIdesign3-domains.pdf}) Presently, Ptolemy actor libraries exist for the domains of bioinformatics and ecology at \[sdmnc\] and \[seek\]. 1 Resources - {link:Ptolemy-II site|http://ptolemy.eecs.berkeley.edu/ptolemyII/} - {link:Science Environment for Ecological Knowledge (SEEK) initiative|http://seek.ecoinformatics.org/} - {link:Scientific Data Management Research and Development Group (SDM Center)|http://sdm.lbl.gov/sdmcenter/} 1 Related - [Kepler] 2004-10-01 14:09:03.512 2004-09-13 12:31:21.481