Semantic MediaWiki/data/smw atts2

About

• Version: 1.7
• Documentation status: unofficial; confirmed only by testing
• Purpose: defines semantic relationships between property-names and property-values, where
  • the value-type has some numeric or logical significance, or
  • the value-type is a non-page string type, or
  • the property is a special property type:
    • _MDAT: seems to be the last-modified timestamp of the page
    • _dat: seems to refer to any property named "date", or possibly any property with "date" type
• Fields:
  • s_id: SMW ID of source page (page where property is being set)
  • p_id: SMW ID of property (name of property being used)
  • value_xsd: value in string format
  • value_num: value in numeric format (non-numeric strings seem to evaluate to 0)

SQL

<mysql>CREATE TABLE `smw_atts2` (

 `s_id` int(8) unsigned NOT NULL,
 `p_id` int(8) unsigned NOT NULL,
 `value_xsd` varbinary(255) DEFAULT NULL,
 `value_num` double DEFAULT NULL,
 KEY `s_id` (`s_id`),
 KEY `p_id` (`p_id`),
 KEY `value_num` (`value_num`),
 KEY `value_xsd` (`value_xsd`)

) ENGINE=InnoDB DEFAULT CHARSET=binary;</mysql>

Examples

<mysql> SELECT s_id, p_id

 , CAST(s.smw_title AS char) AS s_title
 , CAST(p.smw_title AS char) AS p_title
 , CAST(a.value_num AS char) AS a_num
 , CAST(a.value_xsd AS char) AS a_xsd
 FROM
   (smw_atts2 AS a
   LEFT JOIN smw_ids AS s ON a.s_id=s.smw_id)
   LEFT JOIN smw_ids AS p ON a.p_id=p.smw_id;

</mysql>