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Subject: [bpel4people] New Issue: Aggregation Functions Invoked with Empty Node-Set
Target:
WS-HumanTask 1.1 CD 04 rev 2, section 6.2, second table: XPath functions
for Result Aggregation.
Description:
The aggregation function specifications do not describe the return value
for the case where an empty node-set is passed.
Proposal:
See inlined text in the table of aggregation functions below. As the
color code may be lost during mail transmission, I also attached a
document showing the changes.
(See attached file: XPath Extension Functions.doc)
| |
concat | Returns the | In
| concatenation of all |
| string nodes - |
| returns an empty | · node-set of string
| string for an empty | nodes
| node-set |
------------------------+-----------------------+------------------------------
| |
concatWithDelimiter | Returns the | In
| concatenation of all |
| string nodes, |
| separated by the | · node-set of string
| specified delimiter | nodes
| string - returns an |
| empty string for an |
| empty node-set | · delimiter string
------------------------+-----------------------+------------------------------
| |
leastFrequentOccurenc | Returns the least | In
e | frequently occurring |
| string value within |
| all string nodes, or | · node-set of string
| an empty string in | nodes
| case of a tie or for |
| an empty node-set |
------------------------+-----------------------+------------------------------
| |
mostFrequentOccurence | Returns the most | In
| frequently occurring |
| string value within |
| all string nodes, or | · node-set of string
| an empty string in | nodes
| case of a tie or for |
| an empty node-set |
------------------------+-----------------------+------------------------------
| |
voteOnString | Returns the most | In
| frequently occurring |
| string value if its |
| occurrence is above | · node-set of string
| the specified | nodes
| percentage and there |
| is no tie, or an |
| empty string | · percentage value in
| otherwise (including | the range from 0 to
| an empty node-set) | 100
------------------------+-----------------------+------------------------------
| |
and | Returns the | In
| conjunction of all |
| boolean nodes - |
| returns false for an | · node-set of boolean
| empty node-set | nodes
------------------------+-----------------------+------------------------------
| |
or | Returns the | In
| disjunction of all |
| boolean nodes - |
| returns false for an | · node-set of boolean
| empty node-set | nodes
------------------------+-----------------------+------------------------------
| |
vote | Returns the most | In
| frequently occurring |
| boolean value if its |
| occurrence is above | · node-set of boolean
| the specified | nodes
| percentage, or false |
| otherwise (including |
| an empty node-set) | · percentage value in
| | the range from 0 to
| | 100
------------------------+-----------------------+------------------------------
| |
avg | Returns the average | In
| value of all number |
| nodes - returns NaN |
| for an empty | · node-set of number
| node-set | nodes
------------------------+-----------------------+------------------------------
| |
max | Returns the maximum | In
| value of all number |
| nodes - returns NaN |
| for an empty | · node-set of number
| node-set | nodes
------------------------+-----------------------+------------------------------
| |
min | Returns the minimum | In
| value of all number |
| nodes - returns NaN |
| for an empty | · node-set of number
| node-set | nodes
------------------------+-----------------------+------------------------------
| |
sum | Returns the sum | In
| value of all number |
| nodes - returns 0 |
| for for an empty | · node-set of number
| node-set | nodes
Kind Regards
Dieter König
Senior Technical Staff Member, WebSphere Process Server Architect
IBM Software Group, Application and Integration Middleware Software
WSS Business Process Solutions
Phone: +49-7031-16-3426 IBM Deutschland (Embedded
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E-Mail: dieterkoenig@de.ibm.com Schönaicher Str. 220
71032 Böblingen
Germany
IBM Deutschland
Research &
Development
GmbH /
Vorsitzender des
Aufsichtsrats:
Martin Jetter
Geschäftsführung:
Erich Baier
Sitz der
Gesellschaft:
Böblingen /
Registergericht:
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Stuttgart, HRB
243294
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