An implementation of the EPCglobal Filtering and Collection Work Group's ALE (Application Level Events) specification. (This is an ETTK technology.)
Tutorial Details:
What is the Application Level Events (ALE) Preview for RFID?
This technology preview is based on the interface and the XML query language defined by the EPCglobal Application Level Events (ALE) 1.0 specification. ALE allows a client application to submit questions about EPC read events to a network of reader points. In most cases, read points will be RFID readers, although the ALE specification does not actually mandate the use of RFID readers for capturing EPC data. An example of such a question is "Which EPCs issued by IBM are in warehouse A?"
ALE also provides a mechanism for evaluating such questions on an ad hoc basis (that is, in a request-response paradigm) or as a standing request (that is: submit once, get notifications when appropriate).
The main benefit of ALE is facilitation of application development that relies on EPC data input for making business decisions. Without a mechanism such as ALE, access to a network of readers would be a tedious task that would involve accessing various readers through low-level APIs, sorting through the individual read events, aggregating them as appropriate for a given business purpose, and exposing the resulting information to an interested client application. With ALE, the client application can abstract most of these tasks. It must simply compose an XML document and hand it over to a generic engine for interpretation and execution. Thus, ALE allows application developers to focus on the business task at hand and leave the technical details surrounding EPC data input to a dedicated software component. The latest version of the ALE specification can be obtained from the EPCglobal Web site.
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