
Chapter 7 Sun Java System RFID Information Server Configuration 135
■ Sensors – The SENSOR table lists all the RFID readers and antennas in use in the
RFID sensor network.
■ Tag observations – Observations are generated by RFID readers and captured in
two tables in the RFID Information Server.
The CURRENT_OBSERVATION table captures the output of a Delta filter. The
purpose of this filter is to capture the currently visible EPC tags at any particular
sensor.
The OBSERVATION_LOG table captures the history of all tag observations.
■ Containment – Containment refers to the aggregation of one or more tagged
items into a larger item. Relationships between a container and its individual
contents are captured in the CONTAINMENT table. The parent EPC identifies the
container. One or more child EPCs identify the contents. A child EPC can in turn
be the EPC of a container, so the containment relationship can be arbitrarily deep.
■ Transaction IDs – The TX_LOG table maps a set of EPCs to a business transaction
ID similar to a purchase order number or an advance shipment notification
number.
■ Tag allocation – In a distributed information service framework, a central RFID
Information Server can assign ranges of EPC numbers to local RFID Information
Servers or applications at distribution centers. Each local RFID Information Server
requests a range of serialized EPCs from a given manager/object class. The
central RFID Information Server guarantees that each EPC range is used only by
the requesting RFID Information Server. The RFID Information Servers at the
distribution centers track the EPC ranges allocated to and deallocated from the
clients.
RFID Information Server Database Scripts
Refer to the Sun Java System RFID Software 3.0 Installation Guide for details on setting
up sample databases and using the database scripts that are available with the
product.
Refer to the Sun Java System RFID Software 3.0 Developer’s Guide for API information
on accessing the RFID Software databases.
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