| Issues |
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| • | Usability of
broker: |
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| – | Interface
consistency |
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| – | Navigation in
large structures |
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| • | Maintenance
issues: |
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| – | Maintenance of
mappings (subject |
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| gateways are
always changing) |
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| – | Maintenance of
links to browse hierarchy |
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| in each gateway
(e.g., when gateways |
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| restructure) |
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