NAME

       State Chart XML Classes -

   Classes
       class ScXMLAbstractStateElt
           abstract base class for the SCXML 'state' elements.
       class ScXMLAnchorElt
           implements the <anchor> SCXML element.
       class ScXMLAssignElt
           the <assign> SCXML element.
       class ScXMLContentElt
           implements the <content> SCXML element.
       class ScXML
           namespace for static ScXML-related functions.
       class ScXMLDataElt
           the <data> SCXML element.
       class ScXMLDataModelElt
           implements the <datamodel> SCXML element.
       class ScXMLECMAScriptEvaluator
           evaluator for the ECMAScript profile.
       class ScXMLElseElt
           implements the <else> SCXML element.
       class ScXMLElseIfElt
           implements the <elseif> SCXML element.
       class ScXMLElt
           base class for all SCXML elements.
       class ScXMLEltReader
           base class for element reader objects
       class ScXMLEvaluator
           defines an interface for profile-dependent evaluators.
       class ScXMLDataObj
           base class for evaluator data objects in the SCXML data module
       class ScXMLConstantDataObj
           base class for immediate data values
       class ScXMLReferenceDataObj
           A data object representing a reference to another object in the data model.
       class ScXMLAndOpExprDataObj
           Implements the logical AND operator.
       class ScXMLEvent
           Base class for events sent to SCXML state machines.
       class ScXMLEventElt
           implements the <event> SCXML element.
       class ScXMLEventTarget
           base class for event targets for inter-system event communication
       class ScXMLExecutableElt
           base class for all SCXML elements with executable content.
       class ScXMLFinalElt
           implements the <final> SCXML element.
       class ScXMLFinalizeElt
           implements the <finalize> SCXML element.
       class ScXMLHistoryElt
           implements the <history> SCXML element.
       class ScXMLIfElt
           implements the <if> SCXML element.
       class ScXMLInitialElt
           implements the <initial> SCXML element.
       class ScXMLInvokeElt
           implements the <invoke> SCXML element.
       class ScXMLLogElt
           implements the <log> SCXML element.
       class ScXMLMinimumExprDataObj
           implements the data objects for the evaluator for the minimum profile.
       class ScXMLMinimumEvaluator
           implements the evaluator for the minimum profile.
       class ScXMLObject
           Base class for all SCXML objects.
       class ScXMLParallelElt
           implements the <parallel> SCXML element.
       class ScXMLParamElt
           implements the <param> SCXML element.
       class ScXMLScriptElt
           implements the <script> SCXML element.
       class ScXMLScxmlElt
           implements the <scxml> SCXML element.
       class ScXMLSendElt
           the < send> SCXML element.
       class ScXMLStateElt
           implements the <state> SCXML element.
       class ScXMLStateMachine
           Manager for processing events and setting states in SCXML structures.
       class ScXMLTransitionElt
           the <transition> SCXML element.
       class ScXMLValidateElt
           implements the <validate> SCXML element.
       class ScXMLXPathEvaluator
           implements the XPath evaluator.

Detailed Description

       This set of classes is a basic implementation of State Chart XML. It is not complete, nor
       is it necessary conformant to those parts it implements.

       Currently Coin uses SCXML for managing 3D viewer user interaction (the non-model-
       interaction part) - the examiner navigation mode in layman terms.

       The Draft Specification for SCXML is at http://www.w3.org/TR/scxml/.

       See Also:
           Navigation Classes

       Since:
           Coin 3.0

       State Chart XML The ScXML part of Coin is a basic, non-conformant, partial implementation
       of State Chart XML, based on the W3C Working Draft 16 May 2008 of SCXML
       http://www.w3.org/TR/2008/WD-scxml-20080516/. The latest version should be at
       http://www.w3.org/TR/scxml/. Read that document for a basic understanding how SCXML
       documents should be constructed.

       Coin uses SCXML for setting up its navigation systems, to be able to remove hardcoded
       logic for user navigation and externalize it into XML files. This makes it easy for users
       to customize the navigation system for their own purposes.

       Unsupported Items:

       • The <parallel> element is not supported as intended with parallel states. Coin will just
         treat it as an ordinary <state> element for now. Parallel states is not high up on the
         priority list, so expect this to be handled after a lot of other functionality is in
         place.

       • The <datamodel>-related part of the specification is not fully supported.

       • The 'target' attribute in the <transition> element can only identify a single state
         currently, not multiple as you would have to when having support for <parallel> elements
         (which we don't have).

       • The virtual state elements like <history> and <anchor> are just implemented as dummy
         states for now and do not do anything in relation to what they should actually do.

       For learning more about how ScXML is implemented and used in Coin, take a look at
       $COINDIR/scxml/navigation/examiner.xml (or in the Coin source directory,
       data/scxml/navigation/examiner.xml) for an example of how an SCXML system for camera
       navigation looks, and look at the source files in src/navigation/ for the C++ counterparts
       to the same SCXML navigation system.

       Since:
           Coin 3.0

Author

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