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SCXML for Multimodal Applications

SCXML for Multimodal Applications. Jim Barnett Aspect Software August 9, 2006. Introduction: SCXML. A State-Machine Language Based on Harel State Charts Developed by W3C Voice Browser Group Designed for Sophisticated Control Flow Fits DPF (Data/Presentation/Flow) Paradigm

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SCXML for Multimodal Applications

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  1. SCXML for Multimodal Applications Jim Barnett Aspect Software August 9, 2006

  2. Introduction: SCXML • A State-Machine Language • Based on Harel State Charts • Developed by W3C Voice Browser Group • Designed for Sophisticated Control Flow • Fits DPF (Data/Presentation/Flow) Paradigm • Multimodal a special case • Multiple presentation layers • Has Powerful Control Abstractions

  3. Feature: Nested States • Represent Task Decomposition • If in Parent State, in 1 of Child States • Will transition among child states • Child states may themselves have children • Parent State Complete when reaches final child state

  4. SCXML Equivalent • <state id=“GetCreditCard”> <initial id=“GetName”/> <state id=“GetName”> <transition target=“GetNumber”/> </state> <state id=“GetNumber”> <transition target=“GetExpirationDate”/> </state> <state id=“GetExpirationDate”> <transition target=“Done”/> </state> <state id=“Done” final=“true”/> </state>

  5. Feature: Parallel States • Represent Fork/Join Logic • Multiple Child States Active At Once • Represent Loosely Coupled Logic • Terminates When All Child States Reach Final State

  6. SCXML Equivalent <state id=“GrowUp”> <parallel> <state id=“professional”> <initial id=“HighSchool”/> <state id=“HighSchool”> <transition target=“College”/> </state> <state id=“College”> <transition target=“Job”/> </state> <state id=“Job”> <transition target=“Final1”/> </state> <state id=“Final1” final=“true”/> </state> <state id=“personal”> <initial id=“date”/> <state id=“date”> <transition target=“steadyRelationship”/> </state> ….. </state> </parallel> <state>

  7. SCXML Equivalent <state id=“GetCreditCard”> <initial id=“GetName”/> <state id=“GetName”> <onentry> <send target=“server” event=“run” namelist=“name.vxml”/> <send target=“browser” event”setFocus” namelist=“name”/> </onentry> <transition event=“HTML.change” target=“GetNumber”> <send target=“server” event=“halt”/> <assign location=“DM.cardNumber” expr=“_eventData.number”/> </transition> <transition event=“VXML.done” target=“GetNumber”> <assign location=“DM.cardNumber” expr=“_eventData.newValue”/> </transition> </state> ….. </state>

  8. Conclusion • SCXML is a Powerful Language • Compact representation of complex logic • Browsers Must be More Flexible • For multimodal applications • Push HTML pages, halt VXML scripts…

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