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What's new
This page reports the newly implemented
features of MathQL-1 that are not included in the ufficial documentation yet.
Changes and additions to MathQL-1 operators:
- The add operator now accepts a syntax extension allowing
to specify more than one explicit attribute group.
The syntax now is:
<query> := "add" [ "distr" ]? [ <groups> |
<avar> ] "in" <query>
<groups> := <group> [ ";" <group> ]*
<group> := <attribute> [ "," <attribute> ]*
<attribute> := <value> "as" <path>
Examples:
the query add "1" as "a", "2" as "b" in subj "A" gives the result
"A" attr {"a"="1"; "b"="2"} while
the query add "1" as "a"; "2" as "b" in subj "A" gives the result
"A" attr {"a"="1"}, {"b"="2"}.
- The new align operator takes an integer i (represented
as a string), a multiple string value v and returns the same v
where each string with length n < i is prefixed with i - n
spaces. The syntax of the add operator is:
<value> := "align" <string> "in" <value>
This operators aligns strings containing numbers so that their alphabetic
order agrees with their numeric order.
- The intersect operator now intersects the attribute groups
of the mathing subject strings set-theoretically rather than making their
"Cartesian product". This semantics reduces the computational costs and makes
intersection the dual of union.
- The property operator now accepts more than one isfalse
clause to increase the complexity of the constraint condition used to filter
the query results. This feature is exploited in the queries produced by the
HELM query generator.
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