Help:Hash format

Hash format
Comma-separated list, with additional outputs shown in parentheses and extra formatting options
Further Information
Provided by:	Extension "Semantic Result Formats"
Added:	1.6.1
Removed:	still supported
Requirements:	"HashTables" extension
Format name:	hash
Enabled? Indicates whether the result format is enabled by default upon installation of the respective extension.	Yes
Authors:	Daniel A. R. Werner
Categories:	misc
Table of Contents

The result format hash, part of the Extension "Semantic Result Formats" extension, is used to format query results in a way most suitable for further processing by MediaWiki templates or parser functions. It is quite similar to the list format but allows more options for customization. It can either output the result as string with a variety of separators between different values, or store the result directly into an hash (HashTables).

Parameters

Default parameters are optimized for use with HashTable extension or other way of processing the output, not for machine-unfriendly eye-candy like Semantic MediaWiki's proprietary list format. This means all kinds of links and generating of needless information is disabled by default, can be activated though.

Parameter	Description	Allowed values	Default
headers	Way of displaying property names in front of property printout. Value 'show' will display them as links, 'plain' without links. A separator between the property name (header) and the actual property value of a page can be defined by headersep.	show, plain, hide	hide
hidegaps	Whether to print requested but unavailable property and record values separated by separators or leaving them out. E.g. if properties Name, Age and Value are requested, assuming Age and Value are not given on a page, this would return something like '..., Max<PROP><PROP>, ...' without, and '..., Max, ...' with active hidegaps.	none, property, record, all	none
link	Allows to output values as links if possible. If this is set to subject (only for Array), only the page title will be included as link.	all, subject, none	none
limit	The maximum number of results to return (equals the maximum number of pages to display information from and the length of the array or hash if created)	any number	maximum *
Result Separators Note: Also see the possibility to set the default value for result separators via LocalSettings.php
sep	Separator between results per page	any string	', '
propsep	Separator between the requested properties per page	any string	<PROP>
manysep	Separator between many valued property values	any string	<MANY>
recordsep	Separator between member-values of record properties	any string	<RCRD>
headersep	Separator between property name and the actual property value of a requested page property if headers are not set to 'hide'. By default one space ' '. Setting this to something more unique together with HashTables extension available would easily allow to create some kind of two-dimensional array/hash or hash/hash construct.	any string	' '
Special Functionality
name	If given and the HashTables extension is available this will create a hash with the specified name (no visible output then)	any string	not set

* The limit for array and hash query results is set to the maximum set in Semantic MediaWiki's $smwgQMaxInlineLimit config variable by default.

Configuration

There are five configuration variables to configure the default separators. They can be adjusted via LocalSettings.php if required. Although they don't have the hash as part of their names, it applies for the hash format.

$srfgArraySep 

Default value for the sep parameter. Default: ', '

$srfgArrayPropSep 

Default value for the propsep parameter. Default: '<PROP>'

$srfgArrayManySep 

Default value for the manysep parameter. Default: '<MANY>'

$srfgArrayRecordSep 

Default value for the recordsep parameter. Default: '<RCRD>'

$srfgArrayHeaderSep 

Default value for the headersep parameter. Default: ' '

Example

These variables can be set to a normal string value or the can contain an array( 'title', (int)namespace, (array)parameters ), defining one page in the wiki. In case the later is chosen, the parsed content of this site will serve as default value. The value will only be parsed once per page rendering and shouldn't contain any very dynamic content. It is useful though to define a template which can then be used in templates processing the query result any further. Example for definition:

# Default value string '<,,,>' for 'arraysep' parameter:
$srfgArraySep = '<,,,>';

# content of 'Template:SepP' as 'propsep' default value:
$srfgArrayPropSep  = array( 'SepP', NS_TEMPLATE );

# content of 'Template:SepH' with parameters 1='abc' and val='def':
$srfgArrayHeaderSep array( 'SepH', NS_TEMPLATE, array( 1 => 'abc', 'val' => 'def' );

Issue with Special:Ask

In case any configuration variable is set to get a wiki page content as value, this will not work as expected on Special:Ask. This is because the parser is not fully running at the time the value is needed. In this case, if the query is not running in inline-mode, a fallback separator will be loaded from another configuration variable, $srfgArraySepTextualFallbacks. This is an array with the keys sep, propsep, manysep, recordsep and headersep which contain the equivalent default value from above (NOT the one set in LocalSettings.php of course). This variable can be modified in LocalSettings.php as well, though, there is no real benefit from doing so since these values are only going to be used on the semantic search spacial page anyway. One should just be aware of this to avoid confusion.

Examples

Define a Hash with name hashName, Pagenames as associative keys and the value of each result page Name property as value:

{{#ask:
 [[Name::+]]
 | ? Name
 | format = hash
 | name = hashName
}}

Examples

To be added

This documentation page applies to all SMW versions from 1.6.1 to the most current version.

      Other languages: zh-hans

Help:Hash format en 1.6.1