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wrapping dbs

gerardo ramirez geraneo at
Sat May 24 23:46:45 PDT 2003

Wrapping federated databases is an integrative strategy,
to what exempt does a wrapper has a semantic knowledge of
the data it is wrapping? When one indexes flat files the
indexing system has a very primitive knowledge of the
information, is this like the knowledge that a wrapper
has? Discovery Link from IBM (mainly DB2 for life
sciences) has a set of wrappers that bring down the
information so it may be handled via DB2 SQL, so if
Discovery link wraps a Blast output then this blast output
is queryable via SQL. In the moment the wrappers that come
along with DL basically know the syntactic structure of
the file they will bring down, and once wrapped then SQL
may be used as a standard query language, of course you
can wrap as many different databases as you wish but how
does this strategy is different from building a semantic
layer that acts as a mediator instead of just wrapping and
leaving everything on a SQL level? Can every information
be represented via SQL?

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