Latest openEHR data types 1.41

Dear all,

please find the latest openEHR data types specification at http://www.openehr.org/productDT.htm. Changes since the last posted version are:

1.41 Changes to DV_ENCAPSULATED, DV_PARSABLE invariants.

1.4 DV_ENCAPSULATED. text_equivalent renamed to DV_ENCAPSULATED.alternate_text.
         Added invariant for QUANTITY.precision.

1.3 Added timezone to DV_TIME and DV_DATE_TIME and sign to DV_DURATION;
        added linguistic_order to TERM_RELATION; added as_display_string and as_canonical_string
        to all types. Added DV_STATE.is_terminal. Renamed TERM_TEXT as CODED_TEXT.

An XML-schema and a Rational Rose .mdl file will be available for the data types in the next week or so.

- thomas beale