Copyright 2002 Newport Instruments. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, or duplication of any material in this document for a fee or for commercial purposes are prohibited. For all other uses, please contact Robert C. Leif, Ph.D. at rleif@rleif.com The Units schema will be based as much as reasonable on UCUM"The Unified Code for Units of Measure (UCUM) The Unified Code for Units of Measure is a code system intended to include all units of measures being contemporarily used in international science, engineering, and business.; http://aurora.rg.iupui.edu/UCUM/; The Regenstrief Institute For Health Care, Indianapolis, Indiana, US; Gunther Schadow gunther@aurora.rg.iupui.edu and Clement J. McDonald. The attached PDF file was: The Unified Code for Units of Measure Version 1.4, April 27, 2000 Gunther Schadow, Clement J. McDonald Regenstrief Institute for Health Care, Indianapolis Copyright copyright 1998, 1999, 2000, Regenstrief Institute for Health Care. All rights reserved. The UCUN data types used for this work are listed below. They should eventually be extended to include all of the Digital Imaging and Communications in Medicine (DICOM) Part 16: Content Mapping Resource: CONTEXT GROUP 7460, Units of Linear Measurement (Most Restrictive Use: Defined), CONTEXT GROUP 7461, Units of Area Measurement, (Most Restrictive Use: Defined), and CONTEXT GROUP 7462, Units of Volume Measurement, 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. 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.