A key conformance clause on the modification of character sequences, C7, has been tightened to eliminate security risks resulting from deletion of noncharacters from uninterpreted text strings.The formal definitions of normalization formerly presented in Unicode Standard Annex #15, 'Unicode Normalization Forms,' have been moved to Chapter 3, Conformance.The most important of these are noted specifically here. There are several changes to conformance requirements in Unicode 5.2 that impact implementations. Unlike the circled letter symbols, there are no uppercase/lowercase relationships for these new characters. New uppercase parenthesized symbols have been added.An implementation may run into trouble if it assumes that the repertoire of conjoining jamos is fixed, or that all conjoining jamos occur only in the Hangul Jamo block, U+1100.U+11FF. There are a number of new Hangul jamo characters added for support of Old Korean.This may interfere with some implementations' boundary testing for Hangul decomposition. There is now an assigned Hangul jamo character at U+11A7.There is also an entirely new block of CJK Unified Ideographs: CJK Unified Ideographs Extension C (U+2A700.U+2B73F), with characters encoded in the range U+2A700 to U+2B734. Any hard-coded range assumptions about Unified CJK Ideographs in implementations may need fixing, because the end range for those has changed from U+9FC3 to U+9FCB in this version.The effect of this is that for the first time a character in the BMP normalizes to a character not in the BMP: toNFC(U+FA6C) = U+242EE Implementers should check their implementations of normalization to ensure they are not assuming that no BMP character can normalize to a non-BMP character. One of the compatibility CJK ideographs added in this version has a decomposition mapping to a unified CJK ideograph in Extension B.
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Implementers should check their code carefully to ensure that it handles these three characters correctly. Most new characters added to the standard with decompositions cannot be generated by the operations toNFC() or toNFKC(), but these three can. There are three new characters in the newly-encoded Kaithi script that will require changes in implementations which make hard-coded assumptions about composition during normalization.Among the characters added, there are a few notable cases which may impact existing implementations.These cases are highlighted here, so that implementers can check for any problematical assumptions in their code. The exact list of characters added for Version 5.2.0 is documented in the file DerivedAge.txt in the Unicode Character Database.
Adds standardized named sequences for Tamil.Improves the description of compatibility characters in Chapter 2, General Structure.Updates best practices for the use of replacement characters.Clarifies the definition of Deprecated and its relationship to ”strongly discouraged,” and updates the set of Deprecated characters in view of this clearer definition.Revises Section 3.5, Properties to better explain the status of Normative, Informative, Provisional, and Contributory properties.Incorporates into Chapter 3, Conformance the formal definitions of normalization formerly presented in Unicode Standard Annex #15, 'Unicode Normalization Forms.' Sections that were modified include sections 3.6 and 3.11.Updates stability policies to add property value stability guarantees for identifier-related properties, a guarantee of property, property alias and property value alias stability, and a policy on alias uniqueness.Unicode Version 5.2: Colorsnapper 2 1 2 0 M
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