Information Technology Reference
In-Depth Information
the CustSrvMngr. Finally, it may provide updates for the various QoS probes
along the multimedia service delivery chain.
3.5 Metadata Manager
The EIMS Metadata Manager is responsible for performing metadata related tasks
within the scope of the EIMS. These tasks include:
•
Aggregation and enrichment of metadata
from different metadata sources;
•
Contextual metadata collection
from and retrieval by different EIMS compo-
nents; and
•
Metadata conversion between different formats
.
For further details of this EIMS subsystem the interested reader is referred to [19].
3.6 Search Manager
The Search Manager supports searching of Digital Items and browsing of DIDs in
the DID database via a well-defined interface. The search and browsing is based
on the data model specifically developed within ENTHRONE [20] and adopts the
query format as defined by MPEG [21].
The data model supports high-level and low-level features associated to au-
dio-visual content. That is, the Search Manager provides the following main
functionalities:
•
Search by making use of
high-level features
(e.g., keywords) as well as
low-
level features
(e.g., color, shape, etc.);
•
Relevance feedback
by the user, through the submission of user's annotations
upon browsing or consuming the content;
•
Query by relevance feedback
where feedback provided by users, who previ-
ously annotated Digital Items, is considered in the search process.
3.7 Multicast Manager
The Multicast Manager is responsible for all the tasks related to the management
of multicast communication services in ENTHRONE. That is, the multicast over-
lay network and possibly the cross-layer multicast agent, which takes advantage of
IP multicast in the last core network domain towards the customer [22]. The tasks
that the Multicast Manager carries out can be grouped in two main categories:
•
The
overlay network configuration and administration
, which includes the
definition of so-called E-Nodes (i.e., a network component that is part of the
multicast tree which performs packet forwarding and replication) as well as
the subscription and invocation of contracts within network provides (pSLSs).
