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- What's new
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- 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.
-
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- 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"}.
-
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- - 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:
-
-
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- <value> := "align" <string> "in" <value>
-
- This operators aligns strings containing numbers so that their alphabetic
-order agrees with their numeric order.
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- - 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.
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- - The property operator now accepts more than one isfalse
-clause to increase the complexity of the constraint condition used to filter
-the raw query results. This feature is exploited in the queries produced
-by the HELM query generator.
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