IHE ITI Technical Framework
The Final Text ITI Technical Framework is published here in HTML format and is no longer published as PDF. Trial Implementation supplements are available from the Volume 1 Table of Contents.

Appendix F: Character String Comparisons

All metadata character string comparisons shall be done in conformance with the rules of the Unicode standard (http://www.unicode.org/versions/latest/) using the normalized form C defined in Unicode Technical Report 15 ( http://unicode.org/reports/tr15 ).

All XML ID comparisons and OID comparisons shall be compared in a case sensitive way.

Note:   Latin alphabet case-sensitive NFC matching corresponds to byte string matching. The primary impact of this is for non-Latin alphabets. They need to be converted into normalized form before comparison. The TR 15 approach is consistent with the working documents of W3C, although W3C has not yet issued a balloted recommendation that Unicode normalized form C be used. See http://www.w3.org/TR/WD-charreq, http://www.w3.org/International/charlint/, and the current W3C draft (http://www.w3.org/TR/charmod-norm).