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230 webMathematica User GuideMSPExceptionMSPException@typeDan exception that can be thrown by webMathematica page commandsMORE INFORMATION† A number of MSP commands throw an MSPException when some error situation occurs. These arecaught by the page processing code, but it would be permissible for a page author to catch them andprocess them in some intermediate step.† The following exceptions can be thrown by MSPBlock.MSPException@" ParseError "DMSPException@" SecurityError "DMSPException@" ValueError "DMSPException@" VariableError "DMSPException@" NoValueError "DMSPException@" VersionError "Dif the value cannot be interpreted by Mathematicaif the value does not pass the security testif the value is not a string, this indicates a programmatic errorby the page authorif the variable is not a Mathematica symbol, this indicates aprogrammatic error by the page authorif a variable has no valueif a version mismatch problem is foundEXAMPLESBasic Examples (1)In[1]:=Needs@"MSP`"D;If a variable cannot be interpreted, a ParseError exception is thrown. Since the values may be enteredfrom the client, this does not indicate an author error.In[2]:=Catch@ MSPToExpression@"f@"D, _MSPException, ListDToExpression::sntx : Syntax error in or before "f@".Out[2]= 88f@, f@
webMathematica User Guide 231In[4]:=If a variable that is not a Mathematica symbol is encountered, a VariableError exception is thrown. Thisusually indicates an author error.Catch@ MSPValue@x@1DD, _MSPException, ListDOut[4]= 8x@1D, MSPException@VariableErrorD
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Wolfram webMathematica USER GUIDE
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webMathematica Users GuideIntroduct
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Web Server Connections . . . . . .
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Web Services . . . . . . . . . . .
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