ISO 28560-3:2011 Clarification

Authors : Tommy Schomacker (editor of ISO 28560-3)

Identifier: http://biblstandard.dk/rfid/docs/clarification_28560-3.htm

 

Status : For information

Bemark : Valid for ISO 28560-3:2011, not for ISO 28560-3:2014

Published by ISO/TC46/SC4/WG11 RFID in Libraries

Information and documentation, Technical interoperability

Contact : rfid@bs.dk

First version: 4 November 2011

 

 

 

 

This document provides clarification relevant to ISO 28560 Part 3. Some references are made to ISO 28560-1 or its associated clarification document. The headings (below) are referencing entries in table 1 Data elements in ISO 28560-3.

 

Clause 6, Table 1, entry 1 Primary item identifier

ISO 28560-3 tells that this data element can be encoded in two different data blocks, either basic block or library extension block, and specifies how to do it. For information a supplementary description is given below. See also Annex B for encoding examples.

 

The basic block is designed with fixed length fields. The encoding therefore depends on the length of the data element. If the primary item identifier is less than or equal to 16 bytes (octets), it shall always be encoded in the basic block as specified in table 2 (Usage and layout of the basic block).

Otherwise byte position 3 in the basic block is set to 01HEX and the primary item identifier is encoded in the library extension block as specified in table 5 (Usage and layout of the library extension block).

 

If the RFID tag is limited to 32 bytes, it can only contain a truncated basic block, see table 3 (Usage and layout of the truncated basic block). In this case only primary item identifiers less than or equal to 16 bytes (octets) can be encoded on the tag.

 

Clause 6, Table 1, entry 3 Owner institution (ISIL)

ISO 28560-3 tells that this data element can be encoded in two different data blocks, either basic block or library extension block, and specifies how to do it. For information purpose a supplementary description and a few examples are given below. See also Annex B for encoding examples.

 

The basic block is designed with fixed length fields. The encoding therefore depends on the length of the data element. If the ISIL prefix is one or two bytes (octets) and the unit identifier is less than or equal to 11 bytes (octets), the ISIL shall always be encoded in the basic block as specified in table 2 (Usage and layout of the basic block). In this case the string shall be formed as the concatenation of the prefix and the unit identifier. If the prefix is only one character, a blank (U+0020) is added between the prefix and the unit identifier.

 

Otherwise byte position 23 in the basic block is set to 01HEX and the ISIL is encoded in the library extension block as specified in table 5 (Usage and layout of the library extension block). In this case the string shall be the ISIL code including the hyphen.

 

If the RFID tag is limited to 32 bytes, it can only contain a truncated basic block, see table 3 (Usage and layout of the truncated basic block). In this case only ISIL identifiers with a one or two character prefix and a unit identifier less than or equal to 9 bytes (octets) can be encoded on the tag.

 

Note:

ISIL is defined in ISO 15511. It is a variable length identifier that shall consist of a maximum of 16 characters, using digits (Arabic numerals 0 to 9), or letters from the 26-character Roman alphabet (excluding the use of any diacritical marks) and the following special marks solidus (/), hyphen (-) and colon (:). Each ISIL identifier shall be unique in accordance with the repertoire of characters specified in ISO/IEC 10646-1 without regard to case.

For each character and special mark in this limited character repertoire the utf-8 encoding (which is used for encoding of strings in ISO 28560-3) occupies 1 byte (also called octet).

 

Examples:

The ISIL identifier "O-FITHE" is encoded in the basic block as the string "O FITHE" (note: the prefix "O" is a short ISIL form of the non-country code "OCLC"; the hyphen is omitted, but a blank is added because the prefix is only one character.)

 

The ISIL identifier "DK-820010" is encoded in the basic block as "DK820010".

 

The hypothetic ISIL identifier "WXYZ-ABCD" is encoded in the library extension block as "WXYZ-ABCD".

 

The hypothetic ISIL identifier "AB-DEFGHIJKLMNOPQRS" is encoded in the library extension block as "AB-DEFGHIJKLMNOPQRS".

 

Clause 6, Table 1, entry 5 Type of usage

ISO 28560-3 only state how to encode main qualifier of usage code (ref. ISO 28560-1, Annex C).

In a later update of these clarifications will follow guidelines how to encode the sub-qualifier. The editors of ISO 28560-3 are in dialogue with vendors to ensure an optimal solution. If you have an actual need, please contact the convenor of ISO TC46/SC4/WG11, email rfid@bs.dk

 

Clause 6, Table 1, entry 19 Media format (other)

The values of this data element are not specified in ISO 28560-1, but are included in the clarification document for ISO 28560-1, section 4.2.19.

 

Clause 6, Table 1, entry 20 Supply chain stage

ISO 28560-1 defines the code points as decimal values. The clarification note for ISO 28560-1 4.2.20 adds the hexadecimal values. In ISO 28560-3 the values shall be encoded as an 8-bit unsigned integer as specified in Table 1 (Data elements) and table 6 (Usage and layout of the acquisition extension block).

 

To achieve interoperability in host systems, ISO 28560-2 and ISO 28560-3 require a common basis for input to their respective encoding processes and common output from their decoding processes. Each input/output value is required as an 8-bit unsigned integer.

 

Clause 6, Table 1, entry 23 Alternative owner institution

ISO 28560-3 tells that this data element can be encoded in two different data blocks, either basic block or library extension block, and specifies how to do it. For information a supplementary description is given below. See also Annex B for encoding examples.

 

The basic block is designed with fixed length fields. The encoding therefore depends on the length of the data element. If alternative owner institution is less than or equal to 10 bytes (octets), it shall always be encoded in the basic block as specified in table 2 (Usage and layout of the basic block). In this case bytes 21 and 22 are undefined and byte 23 is either 02HEX or 03HEX, where 02HEX indicates a national standardized code not part of ISIL and 03HEX an institution code that is neither part of ISIL nor a national standard.

 

Otherwise byte position 23 in the basic block is set to 01HEX and the alternative owner institution is encoded in the library extension block as specified in table 5 (Usage and layout of the library extension block).

 

If the RFID tag is limited to 32 bytes, it can only contain a truncated basic block, see table 3 (Usage and layout of the truncated basic block). In this case only alternative owner institution less than or equal to 8 bytes (octets) can be encoded on the tag.

 

Annex B, Encoding examples (informative), Table B.1

There is an error in the last row of table B.1. The length of the field is specified to be 13 bytes, but can only be 11 bytes (because the block is limited to 32 bytes). The correct version of table B.1 shall be:

 

Table 1  Example 1, data elements to be encoded

Content

Length

Value

Encoding (hex value)

2. Content parameter

4 bit

1

1

5. Type of usage

4 bit

1 (item for circulation)

1

4. Set information

2 bytes

Item 1 of 1

0101

1. Primary item identifier

16 bytes

1000000056

31303030303030303536000000000000

CRC

2 bytes

 

98A4

3. Owner institution (ISIL)

11 bytes

DK-718500

444B373138353030000000