How to use typeswitch in osb xquery ?

Hi all,
I couldnt understand the syntax of the x query type switch used in osb.Can anybody kindly explain it or give links to examples.
typeswitch (())
case $case-var as element(*) return ()
default ()
1) what should be given inside the typeswitch (()) ?
2) what should be given as this variable $case-var ?
3) what is the meaning of sequence type element(*) ?
4) Is the typeswitch in x query used to avoid multiple nested if or is it something else ?
Thank you.
Edited by: Arun Vikram on Jul 18, 2010 11:47 PM
Edited by: Arun Vikram on Jul 19, 2010 12:00 AM

Hi Arun,
See the section "2.11 Operations on Datatypes" of below doc -
http://www.w3.org/TR/2001/WD-xquery-20010607/
typeswitch is explained with an example in this section. typeswitch is similar concept as "switch" in Java.
1) what should be given inside the typeswitch (()) ?The expression whose dynamic type is being tested.
2) what should be given as this variable $case-var ?Each CASE clause specifies the name of a type, which must be a subtype of the static type of the operand expression, followed by a RETURN expression.
3) what is the meaning of sequence type element(*) ?Any XML node
4) Is the typeswitch in x query used to avoid multiple nested if or is it something else ?As said,The typeswitch expression of XQuery allows users to write queries that are sensitive to dynamic type, yes it helps to avoid multiple nested if to fulfill this use case.
Regards,
Anuj
Edited by: Anuj Dwivedi, TCS on Jul 19, 2010 12:32 PM

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