RFID Data Model for Libraries - biblstandard

RFID Data model for libraries Doc 067
If the item id is too long for this field, it is possible to use an escape and place the
primary item id in the “alternate item id” structured extension.
Encoding:
See “String encoding”.
If no primary item id is assigned (yet) all bytes are filled with chr(0).
If the first byte of the primary item id is chr(1), the item id is stored in the “alternate
item id” structured extension.
3.2.1.6 CRC
Description:
A 16 bit CRC for the mandatory starting block. The CRC itself is excluded from this
calculation.
The CRC is calculated using x 16 + x 12 + x 5 + 1 polynomial with hex(ffff) as start
value.
This value must always be present.
The CRC will be calculated starting from the lowest address, first 19 bytes, then
skipping the two CRC bytes, then 13 bytes for a total of 32 bytes (For chips with 32
data bytes only the last two bytes are assumed to be chr(0), see chapter 3.2.1.8 Owner
library)'
Encoding:
Binary encoding with the lsb stored at the lowest memory location
Se an example of CRC calculations in Annex D.
3.2.1.7 Country of Owner library
Description:
Two character country code according to ISO3166-1. This standard specifies 7 bit
characters and has to be converted.
Encoding:
See “String encoding”.
3.2.1.8 Owner library
Description:
Code for owner library, the ISIL code (International Standard Identifier for Libraries
and Related Organizations ISO 15511) had been foreseen.
The ISIL is used without country code and the – delimiter, i.e. only the “Library
identifier” part.
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