The
results reported in response to a request can be directed back to the requesting client or to a
??????third party??™??™ speci?¬?ed by the requestor.
A read cycle is the smallest unit of interaction with a reader. The result of a read cycle
is a set of EPCs. The output of a read cycle is the input to the ALE. From the ALE
perspective, a read cycle is a single event containing a set of EPCs, with nothing more
implied. An event cycle is one or more read cycles, from one or more readers that are to
be treated as a unit from a client??™s perspective. It is the smallest unit of interaction
between the ALE interface and a client. Clients in the Application Business Logic specify
the boundaries of event cycles to the ALE as part of a request for a report. A report is data
about an event cycle communicated from the ALE implementation to a client. A client
can specify how event cycle boundaries may be extended for a speci?¬?ed duration,
or report periodically; may be triggered by external events; be delimited when no new
EPCs are detected by any reader speci?¬?ed for that event cycle for a speci?¬?ed interval
of time.
The speci?¬?cation de?¬?nes a number of commands, along with their parameters (data
?¬?elds), to de?¬?ne event cycle speci?¬?cations (ECSpec) and corresponding reports.
2.10 ECPIS EPC Information Services
The EPC Information Services (EPCIS) (EPCglobal, 2007d) speci?¬?es a means to enable
disparate applications to leverage EPC data via EPC-related data sharing, both within and
across enterprises.
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