SCXML State Chart Markup Language

SCXML controls the flow of an application SCXML controls modalities –VoiceXML –XHTML –Others, e.g., InkML, SVG SCXML controls Web services Agenda

State Chart XML Represents a state transition system –States –Transitions A B

Possible Actions within a A Multimodal life cycle events Executable content,,

SCXML Sequentially perform the actions in two states done A B

SCXML <transition event= "done" cond="result='OK ̍ '" target="B"/> <transition event= "done" cond="result='Opps'" target="C"/> done OK done Opps A BC Conditional branch

SCXML A CD B Parallel States

SCXML controls the flow of an application SCXML controls modalities –VoiceXML –XHTML –Others, e.g., InkML, SVG SCXML controls Web services Agenda

SCXML + VoiceXML <transition event= "done" target="B"/> state id="B"> done A B Say your destination airport <grammar src= “Airport.grxml” getAirport.vxml

SCXML + XHTML <transition event= "done" target="B"/> state id="B"> done A B {function sendDone…} enter month getAirport.xhtml

SCXML + XHTML + VoiceXML state id="B"> done B <transition event= "done" target="B"/> <transition event= "done" target="B"/> A A1A2 done B

SCXML + InkML + VoiceXML state id="B"> B <transition event= "done" target="B"/> <transition event= "done" target="B"/> A A1A2 done B Another example of multiple modalities

SCXML + InkML + VoiceXML state id="B"> B <transition event= "done" target="B"/> <transition event= "done" target="B"/> A A1A2 done B Tuesday

SCXML + InkML + VoiceXML state id="B"> B <transition event= "done" target="B"/> <transition event= "done" target="B"/> A A1A2 done B Tuesday Las Vegas Portland

SCXML + InkML + VXML B <transition event= "done" target="B"/> <transition event= "done" target="B"/> A A1A2 done B Tuesday Las Vegas Portland Las Vegas Portland Tuesday state id="B">

SCXML controls the flow of an application SCXML controls modalities –VoiceXML –XHTML –Others, e.g., InkML, SVG SCXML controls Web services Agenda

SCXML Control More Than Just Modalities SQL Complex calculations Web services vxml sql complexCalculation xhtml

Implementations (from Wikipedia) scxmlcc An efficient scxml to C++ compiler.scxmlcc Apache Commons SCXML, a pure Java library to parse and execute SCXML diagramsApache Commons SCXML Web interface to an experimental SCXML implementation in the Oz programming language Legian An SCXML engine implemented in Java using Rhino as a Javascript engine. It also supports some additional features such as custom tag libraries and includes. It is not fully W3C compliant.Legian Qt SCXML Engine implemented in C++ as well and tightly integrated with their Signals and Slots concept.Qt SCXML EngineSignals and Slots PySCXML a Python-implementation under active development. Supports a wide range of technologies, including websockets and SOAP. Highly standards-compliant. Also supports the ECMAScript datamodel.PySCXML The PySCXML Console a web-based interactive SCXML console for running and interacting with SCXML documents. Supports the ECMAScript datamodel.The PySCXML Console SCXML4Flex ActionScript/Flex partial port of PySCXML.SCXML4FlexPySCXML SCXMLgui Java Visual Editor for SCXML.SCXMLgui SCION SCXML implemented in portable JavaScript.SCION JSSCxml a Web browser implementation under active development. Highly conformant, with good support for DOM Events. Only supports the ECMAScript datamodel.JSSCxml

References State Chart XML (SCXML): State Machine Notation for Control Abstraction – Multimodal Architecture and Interfaces – Commons SCXML (Open Source) –

Summary SCXML controls the flow of an application SCXML controls modalities –XHTML –VoiceXML –Others, e.g., inkML, SVG SCXML controls Web services