Metadata/Note contents can't include a ledger formatted date?

[Craig Earls]

I am finally starting to play with the Metadata features.  I travel
for business and like to keep track of each trip separately along with
it reimbursement.  I use "Expenses:Company:Travel" for the asset to
charge to.  After each expense I tried putting "; trip: 2011/08/30
Corona"  to show the day of departure and destination.

Running
ledger reg tag trip="2011/08/30 Corona"

yields:

While parsing value expression:
  has_tag(((/trip/, /2011/08/30 Corona/)))
                                       ^
Error: ) operator not followed by argument


If I change my date format to use dashes instead of slashes it work as
expected.  Did I accidentally bump into a value expression?
-- 
Craig, Corona De Tucson, AZ
2008 Brunton Super Stalker
1989 BMW K75 Hannigan
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