Setting a dynamic expiration date in User Task in BPEL 10.1.3.1

Question

I have a user task / human workflow activity within a BPEL 10.1.3.1 project. I need to be able to set the expiration date of the task dynamically that gets assigned within this worklist.
I have been able to use the Human Task Wizard screen (<usertask>.task) to hard code the expiration time. Using the Fixed Duration option of days, hours or minutes. I have tried to use the 'By Expression' to do this but have been unable to get it to work. I have tried to select the /task:task/task:systemAttributes/task:expirationDuration or the /task:task/task:systemAttributes/task:expirationDate element within the task workflow xsd but are unsure how to get it to read the date. I have tried to assign a time component to expirationDate and a time period P0DT0H20M to the expirationDuration element.
Has anyone had experience of this or know whether it can be done? Any help would be appreciated
Thanks

Answer 1

I agree with David.
The lexical representation for duration is the ISO 8601extended format PnYn MnDTnH nMnS, where nY represents the number of years, nM the number of months, nD the number of days, 'T' is the date/time separator, nH the number of hours, nM the number of minutes and nS the number of seconds. The number of seconds can include decimal digits to arbitrary precision.
The values of the Year, Month, Day, Hour and Minutes components are not restricted but allow an arbitrary unsigned integer, i.e., an integer that conforms to the pattern [0-9]+.. Similarly, the value of the Seconds component allows an arbitrary unsigned decimal. Following ISO 8601, at least one digit must follow the decimal point if it appears. That is, the value of the Seconds component must conform to the pattern [0-9]+(\.[0-9]+)?.
An optional preceding minus sign ('-') is allowed, to indicate a negative duration. If the sign is omitted a positive duration is indicated.
For example, to indicate a duration of 1 year, 2 months, 3 days, 10 hours, and 30 minutes, one would write: P1Y2M3DT10H30M. One could also indicate a duration of minus 120 days as: -P120D.
Reduced precision and truncated representations of this format are allowed provided they conform to the following:
* If the number of years, months, days, hours, minutes, or seconds in any expression equals zero, the number and its corresponding designator may be omitted. However, at least one number and its designator must be present.
* The seconds part may have a decimal fraction.
* The designator 'T' must be absent if and only if all of the time items are absent. The designator 'P' must always be present.
For example, P1347Y, P1347M and P1Y2MT2H are all allowed; P0Y1347M and P0Y1347M0D are allowed. P-1347M is not allowed although -P1347M is allowed. P1Y2MT is not allowed.
HTH,
Bas