| Cross-browsing
(1) |
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| • | Enhanced subject
access a key part of |
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| the services
offered by subject |
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| gateways |
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| • | Subject
gateways, however, use many |
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| different subject
schemes |
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| – | Some 'home-grown' |
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| – | Others based on
(or adapted from) |
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| standards |
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