Inheritance by restriction only works if elementFormDefault = unqualified in both the parent and the child of complexTypes This is the prefix name according to the UCUM XML file. Pdf page 13 , Table 4: SI units p.15 and Table 5:Other units from ISO 1000, ISO 2955, and some from ANSI X3.50. p16. OMAC HMI Data Type Overview using W3C XML and STEP. This document responds to the action item from the May 23, 2001 OMAC HMI meeting: Review and compile a list of W3C XML Schema data types and STEP data types that can be applied to OMAC XML Schema (Reference of starting data type) _ John M. July 31. and Unum. However all lower case. Unum is the base for terms From PDF file, page 10, §19.1 allows to limit the set of supported dimensions. Most practically used units contain exponents of -4 to +4, some may contain -5, such as hemodynamic resistance measured traditionally in 1 dyn · s/cm5. Thus if memory is limited, 4 bit per component of the dimension vector could be sufficient. Byte is the equivalent of a Signed_8_Type. The DICOM Value Representations Table has the following fields: VR, Name, Definition, Character Repertoire, and Length of Value. The Value Representation is an enumerated type which includes a two letter abbreviation. It is the data type or class of the DICOM element. Most of theValue Representations are enumerated below. In the future, more can be added as needed. This is a sequence with two choice elements with each of the choice elements providing an abbreviation or a name. This is superior to the old version 0.02, where the two choices were replaced 4 attributes, which considerably decreases the safety of this construct and does not permit the units modifiers to be visable in a document. In order for it to be extensible in child schemas, the Value element and the DICOM attributes had to be removed. These have to be added in their final form to the extension. Meter_Type illustrates that specific units can be created by extension of Units_Type