hi Wenfeng ZHAO, Thanks for your valuable information... can you send the system requirements for this project..
Regards M.Madhaiyan On Tue, Sep 29, 2009 at 8:08 AM, Wenfeng ZHAO <[email protected]> wrote: > Hello M.Madhaiyan, > > Although this topic has no relation with ODE, yet I happen to have learned > something about it and I'd like to share my view to it in the following. > > I believe it is possible, but rarely efficient enough to be used in real > world. Given additional functionality description, usually in form of > Precondition&Effect, to WS - both requested and advertised - the problem can > be reduced to AI planning problem[1][2] as well as automatic theorem proving > problem[1]. And one can also build an automatic composition system from > scratch by searching in the state space of the problem[3][4][5]. But the > essence of the problem that it is at least NP-Hard causes a situation that > such systems are either of rich expressivity but bad performance, or of poor > expressivity but good performance. In my opinion, how to balance > expressivity and computing complexity is a critical issue for this problem, > especially when the target domain is given. > > There are some surveys on this topic, of which I found [1][6][7] are useful > to me. > > Recently I've designed and implemented a new type of automatic composition > system for information-providing WS, SCQR, which is based on a query > rewriting algorithm MiniCon[8][9] from Data Integration domain, which can > automatically create BPEL processes of composition plans that can be > deployed directly on ODE1.3.2. Although its completeness is worse than > previous methods, the performance is rather exciting. It can get first 20 > solutions out of a repository containing 1000 services in less than 10s for > a typical request/services combination. You can download the source codes > from http://semwebcentral.org/projects/scqr/ and try it according to the > specification in ReadMe.txt. Sorry that a paper explaining it in English is > not available now. > > Note the methods I said all aim at stateless WS, and there are some work > aiming at statful WS which are referenced in [6] as "Behavior-Based Service > Composition". > > [1](2004-SWSWPC-RaoJH)A Survey of Automated Web Service Composition Methods > [2] Klusch M. and Gerber A. Semantic web service composition planning with > OWLS-XPlan. In: the 1st Int. AAAI Fall Symposium on Agents and the Semantic > Web. 2005. > [3] Kona S, Bansal A, Gupta G, et al. Automatic Composition of > Semantic Web Services. In: 2007 IEEE Int’l Conf. on Web Services (ICWS > 2007), Salt Lake City, 2007. > [4] Liu Z, Ranganathan A, and Riabov A. ModelingWeb Services using > Semantic Graph Transformations to aid Automatic Composition. In: 2007 IEEE > Int’l Conf. on Web Services (ICWS 2007), Salt Lake City, 2007. > [5] Ambite, J.L. and Kapoor D. Automatically Composing Data Workflows > with Relational Descriptions and Shim Services, in The 6th Int’l Semantic > Web Conf. (ISWC 2007). 2007: Busan, Korea. > [6](2005-wshp-Kuster-24)A classification of issues and approaches in > automatic service composition > [7](2005-rpt-Peer-64)Web service composition as ai planning - a survey > [8]Pottinger R. and Halevy A. MiniCon: a scalable algorithm for answering > queries using views. The Int’l Journal on Very Large Data Bases, 2001, > 10(2-3): 182-198. > [9]Afrati F, Li C and Mitra P, Rewriting queries using views in the > presence of arithmetic comparisons. Theoretical Computer Science, Dec 2006, > 368(1-2):88-123. > > > Thanks for reading > > Wenfeng > > =======On 2009-09-29 at 01:17:06 M.Madhaiyan wrote: ======= > > >hi. > >i am doing project in anna university, chennai, india. during my first > >review, the project reviewers asked me to do the web service composition > >automatically. > > > >In BPEL we have to hard code the composition of various services, but the > >execution is dynamic.. it depends on the user input. > > > >I need the composition should be automatic one.. is there any approach.. > plz > >help me.. > > > >Regards > >M.Madhaiyan > > > >On Mon, Sep 28, 2009 at 4:08 PM, Tammo van Lessen <[email protected] > >wrote: > > > >> Hi, > >> > >> looks like a namespace issue. The name element you're creating in your > >> literal-copy is not in the null-namespace but rather in the BPEL > >> namespace (the default namespace), which is wrong. Try the following > >> literal assign expression: > >> > >> <literal> > >> <ns2:hello xmlns:ns2="http://hello.netbureau.it/";> > >> <name xmlns=""/> > >> </ns2:hello> > >> </literal> > >> > >> HTH, > >> Tammo > >> > >> [email protected] wrote: > >> > hi, > >> > > >> > > >> > this is the correct soap msg i have to send to an external webservice > >> HelloWs and it works: > >> > > >> > <?xml version='1.0' encoding='utf-8'?><soapenv:Envelope > xmlns:soapenv=" > >> http://schemas.xmlsoap.org/soap/envelope/";><soapenv:Body><ns2:hello > >> xmlns:ns2="http://hello.netbureau.it/ > >> "><name>pippo</name></ns2:hello></soapenv:Body></soapenv:Envelope> > >> > > >> > so i try to call with invoke ina bpel process: > >> > > >> > valuating FROM expression "{Literal <?xml version="1.0" > >> encoding="UTF-8"?> > >> > <literal xmlns=" > http://docs.oasis-open.org/wsbpel/2.0/process/executable > >> "> > >> > <ns2:hello xmlns:ns2="http://hello.netbureau.it/";> > >> > <name/> > >> > </ns2:hello> > >> > </literal>}". > >> > > >> > This is the firts part of intialize a variable HelloIn that is the > input > >> of invoke. > >> > defining a literal for instanciate a message to send is ok but in the > >> second step why when i copy this into the HelloIn variable whose type is > >> hello it give me a different soap message ( ns2: namespace prefix > disappear > >> and also the tag name get a bpel namespace..this is not correct!) > >> > > >> > ASSIGN Writing variable 'HelloIn' value '<?xml version="1.0" > >> encoding="UTF-8"?> > >> > <message><parameters><hello xmlns="http://hello.netbureau.it/";> > >> > <name xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable > "/> > >> > </hello></parameters></message>' > >> > > >> > this is wrong.. why???? so i get a SelectionFailure exception when i > try > >> to write into HelloIn.. > >> > > >> > :( > >> > > >> > my wsdl contain <types> <schema.... > >> > and elementFormDefault= "unqualified" > >> > instead bpel schema is qualified and so tns:input is the input of bpel > >> process (Caller.bpel), that is: > >> > > >> > message><payload><CallerRequest xmlns="http://MyTest.com/Test"; > xmlns:S=" > >> http://schemas.xmlsoap.org/soap/envelope/";><input xmlns=" > >> http://MyTest.com/Test > ">pippo</input></CallerRequest></payload></message> > >> > > >> > > >> > Can help me? > >> > > >> > this is the bpel: > >> > > >> > <process > >> > name="Caller" > >> > targetNamespace="http://hello.netbureau.it/"; > >> > xmlns="http://docs.oasis-open.org/wsbpel/2.0/process/executable"; > >> > xmlns:xsd="http://www.w3.org/2001/XMLSchema"; > >> > xmlns:sxt=" > >> http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Trace"; > >> > xmlns:sxed=" > >> http://www.sun.com/wsbpel/2.0/process/executable/SUNExtension/Editor"; > >> > xmlns:tns="http://MyTest.com/Test"; > >> > xmlns:ns2="http://hello.netbureau.it/";> > >> > > >> > <!--schema def for bpel, adding to process tag--> > >> > <!--xsd:schemaLocation="ws_bpel_executable.xsd"--> > >> > > >> > <!-- wsdl Caller + partnerLink defintion--> > >> > <import namespace="http://MyTest.com/Test"; location="Caller.wsdl" > >> importType="http://schemas.xmlsoap.org/wsdl/"/> > >> > <!-- wsdl Ws Helloname + PartenrLinkType definition--> > >> > <import namespace="http://hello.netbureau.it/"; > >> location="Helloname.wsdl" importType="http://schemas.xmlsoap.org/wsdl/ > "/> > >> > <!-- xsd xhema for HellonameWs --> > >> > <!--import namespace="http://hello.netbureau.it/"; > >> location="Helloname.xsd" importType="http://www.w3.org/2001/XMLSchema > "/--> > >> > <partnerLinks> > >> > <partnerLink name="HelloWs" partnerLinkType="ns2:Helloname" > >> partnerRole="WriteHelloMsgRole"/> > >> > <partnerLink name="Caller" partnerLinkType="tns:Caller" > >> myRole="CallerProvider"/> > >> > </partnerLinks> > >> > <variables> > >> > <variable name="CallerOut" > >> messageType="tns:CallerResponseMessage"/> > >> > <variable name="HelloOut" messageType="ns2:helloResponse"/> > >> > <variable name="HelloIn" messageType="ns2:hello" /> > >> > <variable name="ProcessIn" > >> messageType="tns:CallerRequestMessage"/> > >> > </variables> > >> > <sequence> > >> > <receive name="ReceiveFromclient" > >> > createInstance="yes" > >> > partnerLink="Caller" > >> > operation="process" xmlns:tns="http://MyTest.com/Test"; > >> > portType="tns:Caller" > >> > variable="ProcessIn"/> > >> > <assign name="Assign1"> > >> > <copy> > >> > <!-- first part soap message correct--> > >> > <from> > >> > <literal> > >> > <ns2:hello xmlns:ns2=" > http://hello.netbureau.it/ > >> "> > >> > <name/> > >> > </ns2:hello> > >> > </literal> > >> > </from> > >> > <!-- second part soap message wrong --> > >> > <to variable="HelloIn" part="parameters"></to> > >> > </copy> > >> > <copy> > >> > <from>$ProcessIn.payload/tns:input</from> > >> > <to>$HelloIn.parameters/name</to> > >> > </copy> > >> > </assign> > >> > <invoke name="InvokeHelloname" > >> > partnerLink="HelloWs" > >> > operation="hello" > >> > portType="ns2:Helloname" > >> > inputVariable="HelloIn" > >> > outputVariable="HelloOut"/> > >> > <assign name="Assign2"> > >> > <copy> > >> > <from> > >> > <literal> > >> > <tns:CallerResponse> > >> > <tns:result/> > >> > </tns:CallerResponse> > >> > </literal> > >> > </from> > >> > <to part="payload" variable="CallerOut"/> > >> > </copy> > >> > <copy> > >> > <!-- this is work fine without namespace(it depends on > >> web service response)--> > >> > <from>$HelloOut.parameters/return</from> > >> > <to>$CallerOut.payload/tns:result</to> > >> > </copy> > >> > </assign> > >> > <reply name="ReplyToClient" partnerLink="Caller" > >> operation="process" portType="tns:Caller" variable="CallerOut"/> > >> > </sequence> > >> > > >> > </process> > >> > > >> > > >> > > >> > > >> > >> > >> -- > >> Tammo van Lessen - http://www.taval.de > >> > > > > = = = = = = = = = = = = = = = = = = = = > ZHAO Wenfeng (赵文峰) > Ph.D. Candidate > http://www.bupt.edu.cn > >
