[SensorML] SweCommon: Time
echterhoff at uni-muenster.de
Thu Jun 21 10:27:03 EDT 2007
I have a question concerning the possible meanings of swe:Time. Such an
element can have four different representations: a string (before,
after, now or unknown from gml:TimeIndeterminateValueType), a double,
xs:data, xs:time or xs:dateTime.
The meaning of each of the possible representations is quite different:
* gml:TimeIndeterminateValueType does not provide a specific time
instance but rather an indeterminate value (as the name says)
* The double value would always have to be computed with respect to
the given referenceFrame. This could result in a time instance but
could also be a duration or recurring time depending on the
reference frame, or am I missing something?
* xs:date defines a duration (one-day long) at a specific date (e.g.
* xs:time represents an instant of time that recurs every day.
* xs:dateTime finally represents a specific instance of time.
My question is: was it intended to allow all of these different meanings
for the swe:Time element? I thought that swe:Time would represent an
instance of time in the end, but now I am no longer sure about that.
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