Saxon

Legacy ID: #6904158 Legacy Poster: Chris Khan (chriskhan)

When trying to evaluate xpath which references a variable with an empty sequence as a value, I get an error saying that the variable value is null. I spent a good amount of time researching the problem and was hoping for some quick help. I'm using Saxon-B v9.1.0.6 in a .NET 2.0 application on WinXP SP3. The following is the type of behavior I'm referring to: Saxon.Api.Processor proc = new Processor(); {Saxon.Api.Processor} Implementation: {net.sf.saxon.Configuration@bd0a2} IsSchemaAware: false ProductTitle: "SAXON 9.1.0.6 from Saxonica" ProductVersion: "9.1.0.6" SchemaManager: null XmlResolver: {System.Xml.XmlUrlResolver} XmlVersion: 1 XPathCompiler comp = proc.NewXPathCompiler(); {Saxon.Api.XPathCompiler} BackwardsCompatible: false BaseUri: "" comp.DeclareVariable(new QName("","test")); Expression has been evaluated and has no value XPathSelector sel = comp.Compile("for $var in $test return 1").Load(); {Saxon.Api.XPathSelector} ContextItem: '(XPathSelector sel = comp.Compile("for $var in $test return 1").Load();).ContextItem' threw an exception of type 'System.InvalidCastException' sel.SetVariable(new QName("","test"), XdmEmptySequence.INSTANCE); Expression has been evaluated and has no value XdmValue val = sel.Evaluate(); 'sel.Evaluate()' threw an exception of type 'net.sf.saxon.trans.XPathException' base {javax.xml.transform.TransformerException}: {"No value has been supplied for variable $test"} XdmItem item = sel.EvaluateSingle(); 'sel.EvaluateSingle()' threw an exception of type 'java.lang.AssertionError' base {java.lang.Error}: {"Value of variable is undefined (null) Variable test at 1 of null"} XdmValue val = sel.Evaluate(); A local variable named 'val' is already defined in this scope val = sel.Evaluate(); 'sel.Evaluate()' threw an exception of type 'net.sf.saxon.trans.XPathException' base {javax.xml.transform.TransformerException}: {"No value has been supplied for variable $test"} sel = comp.Compile("$test").Load(); {Saxon.Api.XPathSelector} ContextItem: '(sel = comp.Compile("$test").Load()).ContextItem' threw an exception of type 'System.InvalidCastException' sel.SetVariable(new QName("","test"), XdmEmptySequence.INSTANCE); Expression has been evaluated and has no value item = sel.EvaluateSingle(); 'sel.EvaluateSingle()' threw an exception of type 'java.lang.AssertionError' base {java.lang.Error}: {"Value of variable is undefined (null) Variable test at 1 of null"} Any advice, whether on proper XPath or Saxon usage, would be appreciated. This works fine in the context of XSLT processing, so I have assumed that it's a Saxon-specific issue. Chris