PM41717: A RECURSIVE FUNCTION REFERENCE IN XSLT OR XQUERY MAY RESULT IN AN ERROR THAT THE FUNCTION IS NOT OF THE EXPECTED TYPE

8.0.0.1: WebSphere Application Server V8.0 Fix Pack 1
8.0.0.2: WebSphere Application Server V8.0 Fix Pack 2
8.0.0.3: WebSphere Application Server V8.0 Fix Pack 3
8.0.0.4: WebSphere Application Server V8.0 Fix Pack 4
8.0.0.5: WebSphere Application Server V8.0 Fix Pack 5
8.0.0.6: WebSphere Application Server V8.0 Fix Pack 6
8.0.0.7: WebSphere Application Server V8.0 Fix Pack 7
8.0.0.8: WebSphere Application Server V8.0 Fix Pack 8
8.0.0.9: WebSphere Application Server V8.0 Fix Pack 9
8.0.0.10: WebSphere Application Server V8.0 Fix Pack 10
8.0.0.11: WebSphere Application Server V8.0 Fix Pack 11
8.0.0.12: WebSphere Application Server V8.0 Fix Pack 12
8.0.0.13: WebSphere Application Server V8.0 Fix Pack 13
8.0.0.14: WebSphere Application Server V8.0 Fix Pack 14
8.0.0.15: WebSphere Application Server V8.0 Fix Pack 15

APAR status

• Closed as program error.

Error description

• If a stylesheet function in an XSLT stylesheet or a user-
  defined function in an XQuery query calls itself recursively,
  the processor sometimes reports a prepare-time error that
  indicates that the type of the recursive function call is not
  of the type expected in the context in which it was used.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Users of the XML API for IBM WebSphere      *
  *                  Application Server V8.0                     *
  ****************************************************************
  * PROBLEM DESCRIPTION: A recursive function reference in an    *
  *                      XSLT stylesheet or XQuery query         *
  *                      expression sometimes results in a       *
  *                      static error indicating that the type   *
  *                      of the recursive function call is not   *
  *                      of the expected type.                   *
  ****************************************************************
  * RECOMMENDATION:  Install a fix pack that contains this APAR. *
  ****************************************************************
  As the processor analyzes an XSLT stylesheet or XQuery
  query expression, it tries to determine the type of value that
  each function defined by the stylesheet or query will return.
  In the case of a recursive reference to a function, the
  processor temporarily assumes the function would return a
  value with the Sequence Type xs:anyType.  However, a value of
  that type would not be permitted in certain operations, and
  so, if the recursive function reference appears in such an
  operation, such as a boolean expression, the processor
  will report an error indicating that the operand is not of the
  expected type.
  

Problem conclusion

• The problem was resolved by having the processor assume a more
  general Sequence Type of item()* for recursive references to
  functions.  All values have a type that is a subtype of
  item()*, so static analysis of the result of a function
  reference will always indicate that the result of the recursive
  function can be used in the context in which it appears,
  including expressions like boolean expressions.
  
  The fix for this APAR is currently targeted for inclusion in
  fix pack 8.0.0.1.  Please refer to the Recommended Updates
  page for delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

  PM32675

• APAR is sysrouted TO one or more of the following:

Fix information

• Fixed component name

  WEBSPHERE APP S

• Fixed component ID

  5724J0800

Applicable component levels

• R800 PSY