ISO 28560-2:2011 specifies a data model and encoding rules for the use of radio frequency identification (RFID) tags for items appropriate for the needs of all types of libraries (including academic, public, corporate, special and school libraries). The rules for encoding a subset of data elements taken from the total set of data elements defined in ISO 28560-1 are based on ISO/IEC 15962, which uses an object identifier structure to identify data elements.ISO 28560-2:2011 gives guidelines for the choice of the subset of selected data elements defined in ISO 28560-1 for the RFID tags. These subsets of data elements can be different on different items in the same library. The encoding rules also enable the optional data to be organized on the RFID tag in any sequence. In addition, the encoding rules provide for flexible encoding of variable length and variable format data.ISO 28560-2:2011 provides essential standards-based information about RFID in libraries. A source of additional information about implementation issues is also provided.