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$Id$
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Commons SCXML Package
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Version 0.6
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Release Notes
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INTRODUCTION:
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Commons SCXML 0.6 primarily contains new features, along with a
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handful of bug fixes. See about section below for general information
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on Commons SCXML.
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IMPORTANT NOTES:
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o Commons SCXML v0.6 requires Commons Digester v1.8 (mandatory update)
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o The recommended version of Commons JEXL is now v1.1 and the
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recommended version of Commons Logging is v1.1
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o Starting v0.6, all SCXML elements must strictly belong to the
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correct namespace with the following URI (case sensitive):
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http://www.w3.org/2005/07/scxml
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o See bug fixes section for semantic incompatibilities introduced due
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to bugs fixed from v0.5
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NEW FEATURES:
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o The entire Commons SCXML object model as well as the SCXMLExecutor
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instances are now serializable, as long as the user specified content
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in all state contexts is also serializable. This is particularly
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useful in web environments for session persistence and clustering.
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If <data> elements are used; the DOM Level 2 implementation in use
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must also be serializable.
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o There is improved support for XML namespaces in SCXML documents.
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Custom actions may be defined in user-specified namespaces.
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o Deferred XPath expression evaluation, in context of interaction with
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<data> elements, has improved. It is now possible to use namespace
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prefixed XPath expressions based on prefixes used in the document.
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o The SCXMLExecutor instances now provide some element of thread-safety.
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Firing events on a state machine executor instance or reseting it
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are synchronized operations. The underlying state machine needs to
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model any race conditions correctly.
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DEPRECATIONS:
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All deprecations introduced in this version are scheduled for removal in
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v1.0 of the library.
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o [org.apache.commons.scxml.Builtin] The data() and dataNode() methods
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that take two arguments are deprecated. They are replaced by their
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three argument namespace-aware counterparts.
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o [org.apache.commons.scxml.ErrorReporter] All String constants in this
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class have been deprecated. Use constants with the same names in
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org.apache.commons.scxml.semantics.ErrorConstants instead.
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o [org.apache.commons.scxml.io.SCXMLDigester] The custom digester rules
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in this class are deprecated. They should not have been part of the
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public API to begin with.
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o [org.apache.commons.scxml.model.Invoke] The method getParams()
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returning a java.util.Map has been deprecated. Use the method
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params() returning a java.util.List instead. See Javadocs for details.
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BUG FIXES:
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o [SCXML-21] Delay is not processed for <send> element with default
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targettype ("scxml").
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o [SCXML-16] target and targettype attributes of <send> element should
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be evaluated as expressions.
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o [SCXML-14] Allow target of a transition to be omitted.
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OTHER CHANGES:
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o [SCXML-31] <var> and <assign> now log new values.
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ABOUT COMMONS SCXML:
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The Commons SCXML (State Chart XML) project provides a generic
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state-machine based execution environment. It borrows most semantics
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from its namesake Working Draft at the W3C. Anything that can be
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represented as a UML state chart -- business process flows, view
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navigation bits, interaction or dialog management, and many more -- can
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leverage the Commons SCXML library. The library abstracts out the
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environment interfaces, and can be used in numerous server-side and
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client-side runtimes.
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Please visit the website for project information and documentation:
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http://jakarta.apache.org/commons/scxml/
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