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DigiCULT
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Info
27
ADMINISTRATORS
Administrators are directly concerned
with maintaining local servers. Thus each
server in the network has an administra-
tor who uses the Content Management
System for:
- Multimedia Resources Database
Management
- Multimedia Resources Integration
- Digitisation Process
- Multimedia Resources Composition.
Obviously, each server in the network
may have several administrators. The
important aspect to keep in mind is that
there is a need for the resources belon-
ging to each server in the network to be
created and, above all, maintained at a
location where there is adequate compe-
tence available to do so. An administrator
can not manage any resource that may
not be accessed locally on a server.
the corresponding result sets. As an
example, statistics can only be dealt with
in our distributed architecture if part of
the computation is kept on the remote
servers' and part is carried out locally (on
the access server).
All tasks dealing with the user interface
should be concentrated on the client
side, while the server should carry out
searching, and other computationally
intensive operations.
Most of these ideas have been applied
in LORIA's MLIS-ELAN
3
project. The
MLIS-ELAN project developed a general
XML-based distributed software architecture
for accessing and sharing natural language
resources in an open client/server envi-
ronment. Natural language resources
were XML-encoded (using the XML
form of the `Text Encoding Initiative'
4
)
and CORBA
5
was used to allow, in par-
ticular, communication between servers.
Based on our experience with MLIS-
ELAN, we think that the multimedia
resources network may have the
following characteristics:
- Each server is an autonomous unit
containing its own data. For instance,
all resources should be XML-
encoded.
- Each server acts as a `broker' and, if
necessary, transmits the request to
other servers in the network which are
known to it. All messages and requests
flowing between servers should also be
XML-encoded.
- One server is accessible to registered
users through a general-purpose Java-
compatible Web browser. It would also
be interesting to have an XSLT capable
browser.
A HIERARCHY OF USERS
We should consider that there are several
categories of users in the network:
- Administrators: who organise LOCAL
media on servers.
- Designers: who design multimedia
exhibitions.
- End-users: who access exhibitions that
have been built by designers.
Figure 1. An administrator manages locally multimedia resources on a server.
3Multi Lingual Information Society European
Languages Activity Network
4http://www.tei-c.org
5http://www.corba.org