[kepler-dev] EML Unit information in Kepler

[Edward A. Lee]

Dan,

There are two unit systems in Ptolemy II, one that is dynamically
checked and one that is statically checked. Conversions are automatic.
Are you using one of these?

Edward

At 09:48 AM 9/27/2006, Dan Higgins wrote:
>Hi Matt,
>
>     During my recent discussions with Akiko Ogawa, a limitation in the
>current EML2 dataSource actor came up. The basic problem is that with
>the current implementation, there is no way to programatically  get the
>units of attributes! The ports are automatically created and type
>information (e.g. ints, doubles, etc) assigned, but Akiko wanted to have
>the units of each attribute available so that unit conversion could
>automatically take place. [The hope was to have actual unit info and
>desired unit info available as inputs to an actor that could convert the
>actual units to the desired unit for output to some model. This would
>involve reading the actual unit from EML and having the actor figure out
>how to convert it to the desired unit and then apply that conversion to
>all of the data referred to be the EML attribute.]
>
>     Clearly this unit question is similar to that for any type of
>metadata. How do we do automatic conversion? Units are iust a obvious
>case. Unfortunately, our EML2 DataSource actor does not provide any of
>the unit information.
>
>     I am not at all sure how we should/could provide this unit
>information. Will it come with the semantic annotations tied to
>measurement ontologies, or is it a special case that we could handle
>some other way (especially for EML2 actors where the information is
>already in the EML metadata). I think it is a feature that Akiko would
>like to see in Kepler as soon as possible, so I a am suggesting that we
>give it some consideration in the near future.
>
>Dan
>
>--
>*******************************************************************
>Dan Higgins                                  higgins at nceas.ucsb.edu
>http://www.nceas.ucsb.edu/    Ph: 805-893-5127
>National Center for Ecological Analysis and Synthesis (NCEAS) Marine 
>Science Building - Room 3405
>Santa Barbara, CA 93195
>*******************************************************************
>
>
>_______________________________________________
>Kepler-dev mailing list
>Kepler-dev at ecoinformatics.org
>http://mercury.nceas.ucsb.edu/ecoinformatics/mailman/listinfo/kepler-dev

------------
Edward A. Lee
Professor, Chair of EECS
231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253 or 510-642-0455, fax: 510-642-2845
eal at eecs.Berkeley.EDU, http://ptolemy.eecs.berkeley.edu/~eal