DavidNewman: Added property

2011-09-11T19:21:57Z

Added property

New page

'''Allows value'''
is a [[Help:Properties_and_types#Special_properties|special property]] in Semantic MediaWiki with a built-in meaning:
it lists one permissible value for a property.

You can use this special property with a property of any datatype to limit its possible values.
For example, the page for a ''Problem severity'' property might contain:
<nowiki>[[allows value::Enhancement]],[[allows value::Trivial]],[[allows value::Minor]],
[[allows value::Normal]],[[allows value::Major]],[[allows value::Critical]]</nowiki>

=== Ordered properties ===
Enumerating several ''Allows value'' does not put the possible values of a property in that order; properties of [[Type:String]] will still sort in alphabetical order. You can ensure alphabetical sort order is appropriate using a prefix, for example:
<nowiki>[[allows value::a-Enhancement]],[[allows value::b-Trivial]], [[allows value::c-Minor]]...</nowiki>
and then you can [[Help:Semantic_search#Comparators|query]] for greater-than-or-equal or less-than-or-equal values, for example <nowiki>[[</nowiki>''property name''::<c-Minor]]

You can create a property of [[Type:Number]] and give it allowed values that are "pseudo-numbers", for example:
<nowiki>[[Allows value::1 - Low]] [[Allows value::2 - Medium]] [[Allows value::2 - Middling]] ...</nowiki>
SMW's number datatype ignores the "''- description''" after the number. This gives the set of properties a numerical order and lets you make two values equivalent.

Property:Allows value - Revision history

DavidNewman: Added property