gplx/mediawiki/extensions/SemanticMediaWiki/docs/examples/query.description.md

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```php
$descriptionFactory = new DescriptionFactory();
// Equivalent to [[Category:Foo]]
$classDescription = $descriptionFactory->newClassDescription(
new DIWikiPage( 'Foo', NS_CATEGORY )
);
```
```php
// Equivalent to [[:+]]
$namespaceDescription = $descriptionFactory->newNamespaceDescription(
NS_MAIN
);
```
```php
// Equivalent to [[Foo::+]]
$anyValueForSomeProperty = $descriptionFactory->newSomeProperty(
new DIProperty( 'Foo' ),
new ThingDescription()
);
```
```php
// Equivalent to [[:+]][[Category:Foo]][[Foo::+]]
$description = $descriptionFactory->newConjunction( array(
$namespaceDescription,
$classDescription,
$anyValueForSomeProperty
) );
```
```php
// Equivalent to [[Category:Foo]] OR [[Foo::+]]
$description = $descriptionFactory->newDisjunction( array(
$classDescription,
$anyValueForSomeProperty
) );
```