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- Goals and features
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- MathQL-1 is designed to achieve the following goals:
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- - Exploitation of RDF technology
- to manage metadata and compliance with the main requirements for
-an RDF query language. In particular:
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- - MathQL-1 provides facilities for hierarchical constraints
-based on RDF Schema and for
-traversal of compound values of properties.
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- - MathQL-1 provides a full set of Boolean operators to compose
- the query constraints and facilities for selecting URI's or literals by
-means of regular expressions.
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- - MathQL-1 allows to customize the query results specifying
-what part of a solution should be preserved or discarded.
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- - MathQL-1 has a well-conceived semantics defined in term of
- an abstract metadata model, imposes that queries return exhaustive solutions
- and includes a "select-from-where"-like construction.
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- - MathQL-1 supports a machine-processable XML syntax as well as a human-readable
- textual syntax to achieve the best usability.
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- - Careful treatment of query results that are as important
- as the queries themselves. In particular:
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- - MathQL-1 query results have a 4-dimensional geometry whereas
- other languages assume that query results are returned in 1-dimensional
-structures (ie lists of resources) or 2-dimensional structures (ie relational
-database tables). This allows to get better outcomes from queries returning
-structured results.
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- - Besides the syntax for queries, MathQL-1 provides a syntax
- for query results with its own rigorously defined semantics.
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- - Exploitation of constructions borrowed from programming
-languages to allow sophisticated queries that need computation over
-the queried data. In particular:
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- - MathQL-1 supports variables for storing intermediate query
- results, provides iterators over these results, has a conditional operator
- and includes logging facilities for debugging purposes.
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