Siemens MC55 - Manual (Page 370)

MC55 AT Command Set
15. Phonebook Commands
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MC55_ATC_V01.05 Page 370 of 469 2/10/04
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15. Phonebook Commands
The AT Commands described in this chapter allow the external application to access the phonebooks located in
the MC55's memory or on the attached Subscriber Identity Modul (SIM).
15.1 Sort Order for Phonebooks
Due to the support of UCS2 for the
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part of phonebook entries, the sort order for phonebook records fol-
lows the algorithm published as Unicode Technical Standard #10, "Unicode Collation Algorithm".
A memory-optimized version of the proposed collation tables "[AllKeys]" from Unicode Technical Standard #10
is used in order to determine collation weights for Code points between 0000 and 06FF, and composed keys are
used for Code points from ranges 0700 to 33FF, A000 to D7FF and E000 to FFFD. Code Points not referenced
in these tables will be assigned a default collation weight with their unicode value as level 1 weight. Decomposi-
tion is not supported.
Phonebook entries whose names contain only characters from the GSM07.07 default alphabet are converted
internally into their UCS2 equivalents in order to achieve consistent sorting results.
For the user, this means that:
• Punctuation marks and other non-alphabetical characters from the common latin-based character sets, and
from the standard GSM character set, will be sorted before any alphabetical characters. The ordering in which
these marks appear as compared to other non-alphabetical characters from the same group is determined
by their collation weights and does not reflect their code values in the UCS2 or GSM alphabet tables above.
Please refer to www.unicode.org for detail.
• Alphabetical characters from the common latin-based character sets, and from the standard GSM character
set, will be sorted according to their underlying base characters, plus the collation weights of their accent
signs.
• Only collation levels 1 and 2 are regarded, so sorting is not case-sensitive.
Example: the european letters "Å" (GSM 0EH, UCS2 00C5h), "æ" (GSM 1DH, UCS2 00E6h), "ç" (GSM09h,
UCS2 00E7h), "a" (GSM 61H, UCS2 0061h ) and "b" (GSM 62H, UCS2 0062h) will be sorted in order "a", "Е",
"ж" "b","ç" although their numerical values in GSM and UCS2 suggest a different ordering.
Reference(s)
Unicode Technical Standard #10, "Unicode C
ollation Algorithm"