Databases and Systems

pages : “4267-4274",
abstract: ”We have cloned the human perforin gene....",
keywd : SET{“Amino Acid Sequence", “Base Sequence", “Exons",
“Genes, Structural"} } ...}
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where the “. . .” indicates that there are other records in the set that have been omitted.
Translating from ASN.l to this format is straightforward, as it is for a variety of other
data formats. We should remark here that BioKleisli does not represent entire
databases in this format; it is used for data exchange between the query language of a
DBMS or the application programming interface of a data format.
The Collection Programming Language (CPL)
The syntax of CPL used here is similar to that of OQL (2), the ODMG standard for
object-oriented database languages. Rather than giving the complete syntax, we will
illustrate it through a series of examples. The first example extracts the title and
authors from a database DB of the type Publication:
sefofrcd{title : p.title, authors : p.authors}
where \p DB
Note the use of “ \p ” to introduce the variable p. The effect of “ \p DB ”isto
bind p to each element of the set DB. The use of explicit variable binding is needed
when queries are used in conjunction with function definition or pattern matching as
in the example below, which is equivalent to the one above. Note that the ellipsis
“. . .” matches any remaining fields in the DB record.
setof rcd{ title : t, authors : a}
where rcd title : \t, authors : \a, ...} DB
Also, the following queries are equivalent:
sefof rcd {title: t, authors; a}
where rcd {title : \ t,
authors : la,
year:\y...}
y= 1988
sefof rcd { title : t, authors : a}
where rcd {title : \ t,
authors : \ a,
year : 1988, ...} DB