wildcard flowid in framework PIB?

Hi All.
I have a question on the framework PIB. When I look at many of the 
filter attributes, there exist values that can be used as wildcards.

The following are a few examples:
- for source and destination addresses, a prefix length of 0 indicates a 
match of any address
- for DSCP, a value of -1 will match all DSCP values
- for port numbers, you can set the min and max to include all values
- for protocol number, a value of 255 means match all

However, for the FlowId, the range is specified as 0..1048575 which is 
the valid range of the 20 bit label. How is a wildcard FlowId indicated?
/brian