| Accessing types |
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| • | SELECT
VALUE(*) FROM sources; |
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| retrieves
constructors from “sources” |
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| • | CREATE
VIEW sources$v |
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| OF
source; |
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| an object
view with objects of type “source” |
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| • | CREATE
VIEW bsources$v OF bsource |
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| UNDER
sources$v; |
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| an
object view with objects of type “bsource” |
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| which,
at the same time, makes those objects |
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| available
from the “sources$v” |
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| view |
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