Hi Sohanai, [+ Asanthi]
We are using Saxon: HE (Home Edition) for XAPTH 2 functions. AFAIK, we don't select functionality to support so anything supported by library should already be there, which means it's likely HE edition does not contain function you're looking for. Please have a look at [1]. [1] http://www.saxonica.com/html/documentation9.4/about/ On Thu, Aug 4, 2016 at 6:57 PM, Sohani Weerasinghe <soh...@wso2.com> wrote: > Hi ESB Team, > > Please find the summary of issues encountered while testing the XPath 2.0 > functions at [1] ( referred [2] & [3] for syntax) and really appreciate > your input on this > > > *1. "Invalid XPath Syntax" occurs when saving the synapse configuration in > management console* > > This error occurs for below functions: > > - avg- fn:avg((1,2,3,4,5)) > - codepoints-to-string - fn:codepoints-to-string((97, 32, 98, 32, 99))) > - distinct-values - fn:distinct-values( ('a', 'b', 'a') ) -This is > supported when passing the value as an xml payload > - id - //book/section/secRef/fn:id(@refs) > - idref - //book/idref('language')/string(.) > - index-of - fn:index-of( (4, 5, 6, 4), 4) > - max- fn:max((2,3,5)) > - min - fn:min((2,3,5)) > - remove - fn:remove( ('a', 'b', 'c'), 2) > - reverse - fn:reverse((1, 2, 3, 4, 5)) -This is supported when > passing the value as an xml payload > - string-join - string-join( ('a', 'b', 'c'), '') > - subsequence - fn:subsequence(('a', 'b', 'c', 'd', 'e'), 3) > > > *2. Issues in using error() function* > > According to https://www.w3.org/TR/xpath-functions-30/#ERRFOER0000 , > calling the function with empty parameters should give an unidentified > error. But when invoking the service it gives below exception > > Is this accepted? > > ERROR - SynapseXPath Evaluation of the XPath expression fn:error() > resulted in an error > ; Line#: 1; Column#: -1 > net.sf.saxon.trans.XPathException: Error signalled by application call on > error() > at net.sf.saxon.functions.Error.error(Error.java:98) > at net.sf.saxon.functions.Error.evaluateItem(Error.java:55) > at net.sf.saxon.expr.Expression.iterate(Expression.java:429) > at net.sf.saxon.xpath.XPathExpressionImpl.evaluate( > XPathExpressionImpl.java:326) > at net.sf.saxon.xpath.XPathExpressionImpl.evaluate( > XPathExpressionImpl.java:389) > at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath( > SynapseXPath.java:533) > at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf( > SynapseXPath.java:367) > at org.apache.synapse.mediators.MediatorProperty.getEvaluatedExpression( > MediatorProperty.java:138) > at org.apache.synapse.mediators.builtin.LogMediator.setCustomProperties( > LogMediator.java:223) > at org.apache.synapse.mediators.builtin.LogMediator.getCustomLogMessage( > LogMediator.java:146) > at org.apache.synapse.mediators.builtin.LogMediator. > getLogMessage(LogMediator.java:132) > at org.apache.synapse.mediators.builtin.LogMediator.mediate( > LogMediator.java:101) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:97) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:54) > at org.apache.synapse.mediators.base.SequenceMediator.mediate( > SequenceMediator.java:158) > at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive( > ProxyServiceMessageReceiver.java:210) > at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) > at org.apache.synapse.transport.passthru.ServerWorker. > processEntityEnclosingRequest(ServerWorker.java:398) > at org.apache.synapse.transport.passthru.ServerWorker.run( > ServerWorker.java:145) > at org.apache.axis2.transport.base.threads.NativeWorkerPool$ > 1.run(NativeWorkerPool.java:172) > at java.util.concurrent.ThreadPoolExecutor.runWorker( > ThreadPoolExecutor.java:1145) > at java.util.concurrent.ThreadPoolExecutor$Worker.run( > ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:745) > > > *3. "System function is not available with this host language/version" > occurs when invoking the service* > > According to <https://mail.google.com/mail/u/0/goog_627243550> > https://sourceforge.net/p/saxon/mailman/saxon-help/ > thread/50f7f8b9.4090...@falutin.net/, it seems this is an XSLT function, is > that the reason for getting the below error? but at [1] this function is > declared as an XPath function > > > [2016-08-02 12:47:27,875] ERROR - SynapseXPath Evaluation of the XPath > expression fn:format-date(fn:current-date(), '[Y01]/[M01]/[D01]') > resulted in an error > net.sf.saxon.trans.XPathException: System function format-date#2 is not > available with this host language/version > at net.sf.saxon.expr.parser.ExpressionParser.grumble( > ExpressionParser.java:263) > at net.sf.saxon.expr.parser.ExpressionParser.parseFunctionCall( > ExpressionParser.java:2375) > at net.sf.saxon.expr.parser.ExpressionParser.parseBasicStep( > ExpressionParser.java:1731) > at net.sf.saxon.expr.parser.ExpressionParser.parseStepExpression( > ExpressionParser.java:1654) > at net.sf.saxon.expr.parser.ExpressionParser.parseRelativePath( > ExpressionParser.java:1573) > at net.sf.saxon.expr.parser.ExpressionParser.parsePathExpression( > ExpressionParser.java:1557) > at net.sf.saxon.expr.parser.ExpressionParser.parseUnaryExpression( > ExpressionParser.java:1447) > at net.sf.saxon.expr.parser.ExpressionParser.parseExprSingle( > ExpressionParser.java:517) > at net.sf.saxon.expr.parser.ExpressionParser.parseExpression( > ExpressionParser.java:455) > at net.sf.saxon.expr.parser.ExpressionParser.parse( > ExpressionParser.java:391) > at net.sf.saxon.expr.parser.ExpressionTool.make(ExpressionTool.java:94) > at net.sf.saxon.xpath.XPathEvaluator.createExpressionInternal( > XPathEvaluator.java:235) > at net.sf.saxon.xpath.XPathEvaluator.compile(XPathEvaluator.java:376) > at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath( > SynapseXPath.java:532) > at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf( > SynapseXPath.java:367) > at org.apache.synapse.mediators.MediatorProperty.getEvaluatedExpression( > MediatorProperty.java:138) > at org.apache.synapse.mediators.builtin.LogMediator.setCustomProperties( > LogMediator.java:223) > at org.apache.synapse.mediators.builtin.LogMediator.getCustomLogMessage( > LogMediator.java:146) > at org.apache.synapse.mediators.builtin.LogMediator. > getLogMessage(LogMediator.java:132) > at org.apache.synapse.mediators.builtin.LogMediator.mediate( > LogMediator.java:101) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:97) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:54) > at org.apache.synapse.mediators.base.SequenceMediator.mediate( > SequenceMediator.java:158) > at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver.receive( > ProxyServiceMessageReceiver.java:210) > at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) > at org.apache.synapse.transport.passthru.ServerWorker. > processEntityEnclosingRequest(ServerWorker.java:398) > at org.apache.synapse.transport.passthru.ServerWorker.run( > ServerWorker.java:145) > at org.apache.axis2.transport.base.threads.NativeWorkerPool$ > 1.run(NativeWorkerPool.java:172) > at java.util.concurrent.ThreadPoolExecutor.runWorker( > ThreadPoolExecutor.java:1145) > at java.util.concurrent.ThreadPoolExecutor$Worker.run( > ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:745) > > *4. Error in using insert-before() function* > > > According to https://docs.marklogic.com/fn:insert-before if the function > written as > fn:insert-before('a', 0, 'x'), then it gives the below error when invoking > the service > > If the position casts to xs:integer as fn:insert-before('a', > xs:integer(0), 'x') and invoke the service then the result only has 'x' but > the expected result should be 'x,a' > > > [2016-08-02 14:39:23,625] ERROR - SynapseXPath Evaluation of the XPath > expression fn:insert-before('a', 1, 'x') resulted in an error > ; Line#: 1; Column#: -1 > net.sf.saxon.trans.XPathException: Required item type of second argument > of fn:insert-before() is xs:integer; supplied value has item type xs:decimal > at net.sf.saxon.expr.parser.TypeChecker.staticTypeCheck( > TypeChecker.java:404) > at net.sf.saxon.functions.SystemFunction.checkArgument( > SystemFunction.java:117) > at net.sf.saxon.functions.SystemFunction.checkArguments( > SystemFunction.java:100) > at net.sf.saxon.expr.FunctionCall.typeCheck(FunctionCall.java:134) > at net.sf.saxon.expr.parser.ExpressionVisitor.typeCheck( > ExpressionVisitor.java:206) > at net.sf.saxon.xpath.XPathEvaluator.createExpressionInternal( > XPathEvaluator.java:239) > at net.sf.saxon.xpath.XPathEvaluator.compile( > XPathEvaluator.java:376) > at org.apache.synapse.util.xpath.SynapseXPath.evaluateDOMXPath( > SynapseXPath.java:532) > at org.apache.synapse.util.xpath.SynapseXPath.stringValueOf( > SynapseXPath.java:367) > at org.apache.synapse.mediators.MediatorProperty. > getEvaluatedExpression(MediatorProperty.java:138) > at org.apache.synapse.mediators.builtin.LogMediator. > setCustomProperties(LogMediator.java:223) > at org.apache.synapse.mediators.builtin.LogMediator. > getCustomLogMessage(LogMediator.java:146) > at org.apache.synapse.mediators.builtin.LogMediator. > getLogMessage(LogMediator.java:132) > at org.apache.synapse.mediators.builtin.LogMediator.mediate( > LogMediator.java:101) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:97) > at org.apache.synapse.mediators.AbstractListMediator.mediate( > AbstractListMediator.java:54) > at org.apache.synapse.mediators.base.SequenceMediator.mediate( > SequenceMediator.java:158) > at org.apache.synapse.core.axis2.ProxyServiceMessageReceiver. > receive(ProxyServiceMessageReceiver.java:210) > at org.apache.axis2.engine.AxisEngine.receive(AxisEngine.java:180) > at org.apache.synapse.transport.passthru.ServerWorker. > processEntityEnclosingRequest(ServerWorker.java:398) > at org.apache.synapse.transport.passthru.ServerWorker.run( > ServerWorker.java:145) > at org.apache.axis2.transport.base.threads.NativeWorkerPool$ > 1.run(NativeWorkerPool.java:172) > at java.util.concurrent.ThreadPoolExecutor.runWorker( > ThreadPoolExecutor.java:1145) > at java.util.concurrent.ThreadPoolExecutor$Worker.run( > ThreadPoolExecutor.java:615) > at java.lang.Thread.run(Thread.java:745) > > > > *5. nilled() function always gives the result as false* > > ref: http://www.xqueryfunctions.com/xq/fn_nilled.html > > payload: > > <root xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";> > <child>12</child> <child xsi:nil="true"></child> <child></child> <child/> > <child xsi:nil="false"></child> </root> > > function: fn:nilled(//child[1]) > > For all child elements it gives false ( even for the elements which has > xsi:nil) > > > *6. root() function does not give the root element* > > ref:http://www.xqueryfunctions.com/xq/fn_root.html > > payload: > > <a> > <x>123</x> > </a> > > function: fn:root(//x) > > result : 123 > > expected result : > <a> > <x>123</x> > </a> > > > *7. Using the function static-base-uri()* > > ref: http://www.xqueryfunctions.com/xq/fn_static-base-uri.html > > Can someone please mention how to define the function and the usage? > > > > *8. Using the function unordered()* > > ref: https://docs.marklogic.com/fn.unordered > > payload : > > <a> > <x>1</x> > <x>2</x> > <x>3</x> > </a> > > function: fn:unordered(//x) > > result : 1 > > Can someone please explain the usage of this function? it seems the > expected result should be a sequence of items > > > > > -more information on the testing results can be found at [4] > > -Further, when going through the functions at [1] it seems below functions > are only supported for XSLT ( I guess we don't need to support those > functions when considering the XPath 2.0 functions, please correct me if > I'm wrong) > > ref: https://docs.marklogic.com/fn > > functions: > > - current > - current-group > - current-grouping-key > - document > - element-available > - function-available > - generate-id(http://www.xsltfunctions.com/xsl/fn_generate-id.html) > - regex-group > - system-property > - type-available > - unparsed-entity-public-id > - unparsed-entity-uri > - unparsed-text > - unparsed-text-available > > > - XPath 3.0 functions listed at [1] > > acos ,analyze-string,asin,atan,ata2,available-environment-variables,cos, > element-with-id,environment-variable,exp,exp10,filter,fold-left,fold-right > ,format-integer,function-arity,function-lookup,function-name,has-children, > head,innermost,log,log10,map,map-pairs,outermost,parse-json,parse-xml , > path,pi,pow,round,serialize,serialize-json,sin,sqrt,tail,tan, > unparsed-text-lines,uri-collection > > > > [1] http://www.saxonica.com/html/documentation9.4/functions/ > [2] http://www.xqueryfunctions.com/ > [3] https://docs.marklogic.com/js/fn > [4] https://docs.google.com/a/wso2.com/spreadsheets/d/ > 1LLVSTAGrqpouQIkt1p3dRx5_wqjuUa58QnKd7gbgQTU/edit?usp=sharing > > Thanks, > Sohani > > Sohani Weerasinghe > Senior Software Engineer > WSO2, Inc: http://wso2.com > > Mobile : +94 716439774 > Blog :http://christinetechtips.blogspot.com/ > Twitter : https://twitter.com/sohanichristine > > On Mon, Aug 1, 2016 at 4:28 PM, Sohani Weerasinghe <soh...@wso2.com> > wrote: > >> According to [1] if I test the distinct-values function,it behaves as >> explained below: >> >> >> 1. If I use a rest mock service to get the response and then get the >> distinct values : >> >> Rest mock service response: >> >> <catalog xml:base="http://example.org/ACC/";> <product dept="WMN"> >> *<number>557</number> >> <number>44</number>* >> *<number>44</number>* </product> </catalog> >> >> Rest API: >> >> <api xmlns="http://ws.apache.org/ns/synapse"; name="sample123" >> context="/test123"> <resource methods="POST GET"> <inSequence> <send> >> <endpoint> <address uri="http://localhost:8080/getResult"/> </endpoint> >> </send> </inSequence> <outSequence> <log level="custom"> <property >> xmlns:fn="http://www.w3.org/2005/xpath-functions"; xmlns:ns=" >> http://org.apache.synapse/xsd"; xmlns:base="http://test"; name="testValue" >> *expression="fn:**distinct-values**(//product/*)"/*> >> </log> </outSequence> </resource> </api> >> >> >> Then expected result is : *557, 44* >> >> But I am getting only *557* >> >> Am I missing something here? >> >> 2. If I directly use this function as below >> >> <proxy xmlns="http://ws.apache.org/ns/synapse"; >> name="testProxy" >> transports="http https" >> startOnLoad="true"> >> <description/> >> <target> >> <inSequence> >> <log level="custom"> >> <property xmlns:fn="http://www.w3.org/2005/xpath-functions"; >> xmlns:xs="http://www.w3.org/2001/XMLSchema"; >> xmlns:ns="http://org.apache.synapse/xsd"; >> name="testValue" >> expression="*fn:**distinct-values**(('a', 'b', >> 'a'))*"/> >> </log> >> </inSequence> >> <outSequence/> >> </target> >> </proxy> >> >> Then I'm getting the exception "invalid XPapth expression" in saving the >> proxy >> >> But according to [1] it seems both ways are correct >> >> >> [1] http://www.xqueryfunctions.com/xq/fn_distinct-values.html >> >> Thanks, >> Sohani >> >> Sohani Weerasinghe >> Senior Software Engineer >> WSO2, Inc: http://wso2.com >> >> Mobile : +94 716439774 >> Blog :http://christinetechtips.blogspot.com/ >> Twitter : https://twitter.com/sohanichristine >> >> On Mon, Aug 1, 2016 at 3:54 PM, Sohani Weerasinghe <soh...@wso2.com> >> wrote: >> >>> >>> >>> >>> Sohani Weerasinghe >>> Senior Software Engineer >>> WSO2, Inc: http://wso2.com >>> >>> Mobile : +94 716439774 >>> Blog :http://christinetechtips.blogspot.com/ >>> Twitter : https://twitter.com/sohanichristine >>> >>> On Mon, Aug 1, 2016 at 1:28 PM, Sohani Weerasinghe <soh...@wso2.com> >>> wrote: >>> >>>> Hi All, >>>> >>>> It seems, the " Invalid XPapth expression" comes when we use two >>>> brackets in the function as below >>>> >>> >>> >>> While I was testing further I found that below function works perfectly >>> even it has two brackets, so that means the syntax of the above mentioned >>> functions are correct. >>> >>> So, are these functions not supported in ESB? Appreciate your input on >>> this >>> >>> fn:dateTime(xs:date('2006-08-15'), xs:time('12:30:45-05:00')) >>> >>> >>>> fn:codepoints-to-string(*(*2309, 2358, 2378, 2325*)*) >>>> fn:string-join(('a', 'c'), 'bbb') >>>> >>>> >>>> >>>> >>>> >>>> >>>> Sohani Weerasinghe >>>> Senior Software Engineer >>>> WSO2, Inc: http://wso2.com >>>> >>>> Mobile : +94 716439774 >>>> Blog :http://christinetechtips.blogspot.com/ >>>> Twitter : https://twitter.com/sohanichristine >>>> >>>> On Mon, Aug 1, 2016 at 12:06 PM, Sohani Weerasinghe <soh...@wso2.com> >>>> wrote: >>>> >>>>> Hi All, >>>>> >>>>> I am validating the Xpath 2.0 functions support in ESB ( please refer >>>>> [1]) and I am using below configuration in defining 'avg' function >>>>> (Referred [2]), but it seems I am using the wrong syntax. >>>>> >>>>> <property xmlns:fn="http://www.w3.org/2005/xpath-functions"; >>>>> xmlns:test="http://test"; >>>>> xmlns:ns="http://org.apache.synapse/xsd"; >>>>> name="testValue" >>>>> * expression="fn:avg((3,4,5))"/>* >>>>> >>>>> Can someone please point the correct syntax? >>>>> >>>>> Since avg function requires a single parameter, is there a way to >>>>> define the integer values externally ( may be using a property mediator ) >>>>> and use it inside the function ? >>>>> >>>>> If this syntax is correct, is this function not supported in ESB? >>>>> >>>>> Really appreciate your input on this >>>>> >>>>> FYI: When saving the proxy, I'm getting below exception: >>>>> >>>>> [2016-08-01 11:41:11,718] ERROR - ProxyServiceAdmin Unable to save >>>>> changes made for the proxy service : testProxy. Restored the existing >>>>> proxy... :: Invalid XPapth expression : fn:avg((3,4,5)) >>>>> org.apache.synapse.SynapseException: Invalid XPapth expression : >>>>> fn:avg((3,4,5)) >>>>> at org.apache.synapse.config.xml.MediatorPropertyFactory. >>>>> getMediatorProperties(MediatorPropertyFactory.java:106) >>>>> at org.apache.synapse.config.xml.LogMediatorFactory. >>>>> createSpecificMediator(LogMediatorFactory.java:111) >>>>> ....... >>>>> >>>>> >>>>> >>>>> [1] Xpath 2.0.0 functions supported by ESB >>>>> [2] https://www.w3.org/TR/xpath-functions/#func-avg >>>>> Sohani Weerasinghe >>>>> Senior Software Engineer >>>>> WSO2, Inc: http://wso2.com >>>>> >>>>> Mobile : +94 716439774 >>>>> Blog :http://christinetechtips.blogspot.com/ >>>>> Twitter : https://twitter.com/sohanichristine >>>>> >>>> >>>> >>> >> > -- Regards, *Shafreen* Software Engineer WSO2 Inc Mobile : 077-556-395-1
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