query

$descriptionFactory = new DescriptionFactory();

// Equivalent to [[Category:Foo]]
$classDescription = $descriptionFactory->newClassDescription(
    new DIWikiPage( 'Foo', NS_CATEGORY )
);

// Equivalent to [[:+]]
$namespaceDescription = $descriptionFactory->newNamespaceDescription(
    NS_MAIN
);

// Equivalent to [[Foo::+]]
$anyValueForSomeProperty = $descriptionFactory->newSomeProperty(
    new DIProperty( 'Foo' ),
    new ThingDescription()
);

// Equivalent to [[:+]][[Category:Foo]][[Foo::+]]
$description = $descriptionFactory->newConjunction( array(
    $namespaceDescription,
    $classDescription,
    $anyValueForSomeProperty
) );

// Equivalent to [[Category:Foo]] OR [[Foo::+]]
$description = $descriptionFactory->newDisjunction( array(
    $classDescription,
    $anyValueForSomeProperty
) );