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|
| feature | languages | example |
|---|---|---|
| disjunction | algae | (dc::title ?paper "Query Langs") || (dc::subject ?paper "Query Langs") |
| safe negation | algae | (dc::title ?paper "Query Langs") ! (dc::subject ?paper "Query Langs") |
| outer join | XUL, algae | (dc::title ?paper "Query Langs") ~ (dc::subject ?paper "Query Langs") |
| value constraints | Squish | WHERE age > 7 |
| premis | DQL, RuleML, algae | |
| proof (justification request) | DQL*, cwm*, algae* | |
| size bound | DQL, algae | |
| pattern restriction | DQL |
* in progress
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