Difference between revisions of "SemanticMediaWiki"
From Wiki4Intranet
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== Our improvements == | == Our improvements == | ||
| − | * Query optimizer: identical subqueries are executed only once, identical terms are removed from conjunctions/disjunctions («a AND a», «a OR a» == just a) | + | * Query optimizer: identical subqueries are executed only once (for example, in <tt><nowiki><q>a OR b</q> <q>c OR d <q>a OR b</q></q></nowiki></tt> the «a OR b» part will be executed only once), identical terms are removed from conjunctions/disjunctions («a AND a», «a OR a» == just a) |
* Conjunction-of-disjunctions execution bug: in the original SMW, «(a OR b) AND (c OR d)» query was not executed at all! (test case: <tt><nowiki>{{#ask: <q>[[A::B]] OR [[C::D]]</q> <q>[[E::F]] OR [[G::H]]</q> | format=debug }}</nowiki></tt>). Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/19 | * Conjunction-of-disjunctions execution bug: in the original SMW, «(a OR b) AND (c OR d)» query was not executed at all! (test case: <tt><nowiki>{{#ask: <q>[[A::B]] OR [[C::D]]</q> <q>[[E::F]] OR [[G::H]]</q> | format=debug }}</nowiki></tt>). Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/19 | ||
* Negation operator support: syntax is <tt><nowiki>{{#ask: [[prop::val]] !<q>...subquery...</q> }}</nowiki></tt> or just <tt><nowiki>{{#ask: [[prop::val]] ![[prop2::val2]] }}</nowiki></tt>. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/20 | * Negation operator support: syntax is <tt><nowiki>{{#ask: [[prop::val]] !<q>...subquery...</q> }}</nowiki></tt> or just <tt><nowiki>{{#ask: [[prop::val]] ![[prop2::val2]] }}</nowiki></tt>. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/20 | ||
* Disable forced type-named properties: in the original SMW, data type aliases also have an unpleasant side-effect: if a property name matches the alias of some data type (for example «Telephone number») — the property will have that data type forced and you cannot override it. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/21 | * Disable forced type-named properties: in the original SMW, data type aliases also have an unpleasant side-effect: if a property name matches the alias of some data type (for example «Telephone number») — the property will have that data type forced and you cannot override it. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/21 | ||
* Automatic refresh of all pages with semantic queries on any property update — in the original SMW you have to manually refresh it every time. Of course this can lead to frequent cache flushes — even the queries that don’t use the updated property are flushed — but at least the user always gets correct query results. | * Automatic refresh of all pages with semantic queries on any property update — in the original SMW you have to manually refresh it every time. Of course this can lead to frequent cache flushes — even the queries that don’t use the updated property are flushed — but at least the user always gets correct query results. | ||
Revision as of 19:36, 14 November 2013
SemanticMediaWiki is a MediaWiki extension.
- Main purpose: Associate semantic properties with wiki pages, and various features based on it.
- Repository: https://github.com/mediawiki4intranet/SemanticMediaWiki
- Homepage: http://semantic-mediawiki.org, SemanticMediaWiki on mediawiki.org
- License: GPLv2.0+
- Created: 2006-08-22
- Our rating: May be useful (3)
Status for Mediawiki4Intranet distribution:
- Inclusion date: 2012-12-12
- Included version: 2.3.x
- Improvement status: Forked in MediaWiki4Intranet with major improvements
Our improvements
- Query optimizer: identical subqueries are executed only once (for example, in <q>a OR b</q> <q>c OR d <q>a OR b</q></q> the «a OR b» part will be executed only once), identical terms are removed from conjunctions/disjunctions («a AND a», «a OR a» == just a)
- Conjunction-of-disjunctions execution bug: in the original SMW, «(a OR b) AND (c OR d)» query was not executed at all! (test case: {{#ask: <q>[[A::B]] OR [[C::D]]</q> <q>[[E::F]] OR [[G::H]]</q> | format=debug }}). Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/19
- Negation operator support: syntax is {{#ask: [[prop::val]] !<q>...subquery...</q> }} or just {{#ask: [[prop::val]] ![[prop2::val2]] }}. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/20
- Disable forced type-named properties: in the original SMW, data type aliases also have an unpleasant side-effect: if a property name matches the alias of some data type (for example «Telephone number») — the property will have that data type forced and you cannot override it. Patch sent to github: https://github.com/SemanticMediaWiki/SemanticMediaWiki/pull/21
- Automatic refresh of all pages with semantic queries on any property update — in the original SMW you have to manually refresh it every time. Of course this can lead to frequent cache flushes — even the queries that don’t use the updated property are flushed — but at least the user always gets correct query results.
