Help:Datatype "Text"

Text
Holds text of arbitrary length
Further information
Provided by:	Semantic MediaWiki
Since version:	1.0
Until version:	still in use
Datatype ID:	_txt
In this wiki:	Text
Table of Contents

The datatype Text is used to store strings of arbitrary length, i.e. text. Since Semantic MediaWiki 1.8.0Released on an unknown date unknown versions of MediaWiki this datatype depreciated datatype "String"Holds character sequences up to 255 characters for data store SMWSQLStore3 and replaced it entirely in Semantic MediaWiki 1.9.0Released on an unknown date unknown versions of MediaWiki. Thus it is now possible to use specific values in semantic queries, or to sort query results by such values. It has the following restriction:

If you want to store special character sequences like "::", you need to store them using the parser function #set, instead of using in-text annotation syntax "[[Property::value]]" notation. Thus you cannot embed "regular" semantic annotations inside a text property.

You can use some wiki markup inside a text property such as runs of ' for bold and italic, and the markup will change the appearance of the text.

Restricting values

Since Semantic MediaWiki 1.0Released on an unknown date unknown versions of MediaWiki you can use special property "Allows value"Lists one permissible value for a property to restrict a property to a particular set of values. For example you could limit a property like "Status" to values like "Active", "Pending", etc. Since Semantic MediaWiki 2.4.0Released on an unknown date unknown versions of MediaWiki special property special property "Allows pattern"Pattern to match a permissible value lets you restrict values according to patterns matching regular expressions. Semantic MediaWiki 2.4.0Released on an unknown date unknown versions of MediaWiki also added special property "Has uniqueness constraint"Allows to restrict value annotation to be unique allowing to annotate a unique data value only once.

Starting with Semantic MediaWiki 3.0.0Released on an unknown date unknown versions of MediaWiki invalid data value annotations will be shown directly on the page together with a warning sign instead of just showing a warning sign as in previous versions.1 See also the page on special property "Has improper value for"Alerts in case the assigned value to a property is invalid.

Searching within values

Values of type Text are searchable. The length of the string you can search on is variable, depending on a couple of factors. In a nutshell:

• If you use the regular syntax for query conditions, as is more fully explained on the help page about selecting pages,2 the searchable length is limited to :
  • the first 40 characters if more than 72 characters are stored as property value (SMW ≥ 1.8.x),
  • all 72 characters if a maximum of 72 characters are stored as property value (SMW ≥ 1.8.x),
  • or to 300 if $smwgFieldTypeFeatures is set to SMW_FIELDT_CHAR_LONG 3 (SMW ≥ 3.0.0).4
• If you use full-text search5 (SMW ≥ 2.5.0), provided that it is enabled on your wiki, you are no longer bound to a maximum of 72 characters.

Compatibility note

In Semantic MediaWiki 1.8.0Released on an unknown date unknown versions of MediaWiki only this datatype still had the old behaviour for data store SMWSQLStore2 as explained on the help page for previous versions of Semantic MediaWiki. Starting with Semantic MediaWiki 1.9.0Released on an unknown date unknown versions of MediaWiki you will have to change datatype declarations with special property "Has type"Assigns a datatype to a property from datatype "String"Holds character sequences up to 255 characters to this datatype if you still have these on property pages since aliasing of "String" for "Text" may be removed in any later version of Semantic MediaWiki.

Comparing the datatypes "Page" and "Text"

Table of comparison between properties of datatype "Page"Holds names of wiki pages, and displays them as a link and datatype "Text"Holds text of arbitrary length
	Property of datatype "Page"	Property of datatype "Text"
Naming values
Characters permitted	Value has the naming restrictions that apply to page titles in MediaWiki. See the documentation at MediaWiki.org.	Value may contain arbitrary text, including markup (such as that for bold and italic)
Length of value permitted	Value may not be longer than 255 bytes, again because of restrictions that apply to page titles in MediaWiki	Value may be longer than 255 bytes
Use of values in query statements
Support for equivalent values?	Value can be made an alias of another 'Page' value. This is achieved using MediaWiki's #REDIRECT syntax, which is used to forward users from a variant page title to the target page.	Value cannot be made an alias of another 'Text' value.
Wildcards	Value accepts wildcards in queries	Value accepts wildcards in queries
Number of characters searchable (using wildcards and comparators)	Value is searchable for all 255 bytes	Value is searchable for the first 40 characters (if more than 72 characters were stored as property value) or 72 characters (if a maximum of 72 characters were stored as property value) for users of SMWSQLStore3 not using the full-text search feature. No restriction for SMWElasticStore.
Inverse querying	Yes, property allows for inverse querying. In this way, a list of unique property values can be retrieved.	No, property does not allow for inverse querying. To retrieve a set of unique property values, see some alternative approaches listed here, which may or may not offer a solution.
Annotating values	Value cannot itself be annotated. However, the page associated with a value may hold semantic annotations and so it can be the basis for extended queries such as subqueries. In addition, it can be the target for another property-value pair, making it queryable in different contexts.	Value cannot itself be annotated. However, it can be the target for another property-value pair, making it queryable in different contexts.
Appearance of values in printout statements
Appearance without special formatting	Value returned by a query normally appears as a page link.	Value returned by a query is rendered as-is in wiki text. This means that markup, such as that for bold and italic (see above), is usually rendered, although there may be exceptions.
Special formatting	Value can be de-linked by setting the query parameter link= (available in most result formats) to none. Additional formatting is usually achieved by means of templates.	Additional formatting is usually achieved by means of templates.
Other
Service links	Property supports service links	Property does not support service links

Examples

API example

<ul><li>The part "|Text" of the query was not understood.Results might not be as expected.</li> <!--br--><li>The part "]]" of the query was not understood.Results might not be as expected.</li></ul>

See also

• Help page on datatype "Keyword"Holds text of restricted length that is being normalised (similar to datatype Text)
• Help page on datatype "Code"Holds technical, pre-formatted texts (similar to datatype Text)

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