Greetings,
I was surprised to discover that an xsd:time casting function was not
available to SPARQL expressions with TBC. I expect the limitation is
with one of the underlying libraries. The expression:
LET( ?time := xsd:time("12:34:56") ) .
produces the warning:
WARN [Thread-34] (ALog.java:48) - URI <http://www.w3.org/2001/
XMLSchema#time> has no registered function factory
Checking the SPARQL spec, I don't see xsd:time listed as a supported
function. But then neither is xsd:date() which is supported through
TBC. Is there a list of casting functions available? Why wouldn't they
all be supported?
One more note on xsd:time. I noticed when selecting a datatype range
that xsd:time appears in the list, but is the only one to have a plain
blue icon. Since a clock icon is in use by xsd:dateTime, I'd like to
suggest a "T" or perhaps an hourglass. A last thought for the
datatype icons, a background color of green, matching that of the
datatype property icon, would give some mnemonic continuity.
thanks!
-Daniel
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