6274 2008-12-04 14:59:52 +0000 Reference to "Alphabetic" in 7.17.2 letter-spacing 2008-12-04 17:21:37 +0000 1 1 1 Unclassified XSLFO XSL-FO 1.1 All All RESOLVED FIXED http://lists.w3.org/Archives/Public/xsl-editors/2006JanMar/0028.html P2 normal --- 1 tgraham alb.w3c xsl-editors oldest_to_newest 22677 0 tgraham 2008-12-04 14:59:52 +0000 I've just stumbled over something in the spec. 7.17.2 letter-spacing (in XSL 1.1 CR, similar in XSL 1.0) mentions that letter-spacing is applied in halves before and after every character that is classified as "Alphabetic" in the Unicode database. This does not include characters like "-" (002D) or "/" (002F). Assume an fo:block which allows for letter-spacing that contains the text "XSL-FO". Between "S" and "L", you get two half letter-spaces (together 1 letter-space). Between "L" and "-", you get only one half letter-space if you strictly follow the spec. This is not quite what I would expect and not what various layouters currently do (Apache FOP, two commercial FO implementations I checked, OpenOffice 2.0 and Word 2003). Am I missing something or is this a problem in the spec? For quick reference, here's the beginning of the character ranges making up "Alphabetic" characters (from DerivedCoreProperties.txt, v4.1.0): # Derived Property: Alphabetic # Generated from: Lu+Ll+Lt+Lm+Lo+Nl + Other_Alphabetic 0041..005A ; Alphabetic # L& [26] LATIN CAPITAL LETTER A..LATIN CAPITAL LETTER Z 0061..007A ; Alphabetic # L& [26] LATIN SMALL LETTER A..LATIN SMALL LETTER Z 00AA ; Alphabetic # L& FEMININE ORDINAL INDICATOR 00B5 ; Alphabetic # L& MICRO SIGN 00BA ; Alphabetic # L& MASCULINE ORDINAL INDICATOR 00C0..00D6 ; Alphabetic # L& [23] LATIN CAPITAL LETTER A WITH GRAVE..LATIN CAPITAL LETTER O WITH DIAERESIS 00D8..00F6 ; Alphabetic # L& [31] LATIN CAPITAL LETTER O WITH STROKE..LATIN SMALL LETTER O WITH DIAERESIS 00F8..01BA ; Alphabetic # L& [195] LATIN SMALL LETTER O WITH STROKE..LATIN SMALL LETTER EZH WITH TAIL 22689 1 tgraham 2008-12-04 17:21:37 +0000 This modifies http://lists.w3.org/Archives/Public/xsl-editors/2007JanMar/0005.html The XSL FO SG decided to start the processing of an erratum to XSL 1.1 as follows: Change to 7.17.2 letter-spacing: Replace the paragraph "For an fo:character that in the Unicode database is classified as "Alphabetic", unless the treat-as-word-space trait has the value "true", the space-start and space-end traits are each set to a value as follows:" with The set of fo:characters to which the letter-spacing is applied is implementation defined. Note: Typically the set is all characters with the following exceptions: - combining diacritics - characters where the treat-as-word-space trait has the value "true" - fixed witdh spaces (U+2000 - U+200B) and dashes (U+2012 - U+2013) - certain symbols, e.g. box drawing - characters in scripts where the letters are connected; e.g. Arbaic - characters in fonts where the letters are connected; e.g. a latin "script" font For an fo:character that in the Unicode database is classified as "Alphabetic", unless the treat-as-word-space trait has the value "true", the space-start and space-end traits are each set to a value as follows: