... TWikiMetaDotPm . All TWiki topics have data (text) and meta-data (information about the topic). ... A meta-data object is a hash of different types of meta-data (keyed on the type, such as 'FIELD' and 'TOPICINFO'). ... As well as the meta-data, the object also stores the web name, topic name and remaining text after meta-data extraction. ... Iterate over the values selected by the regular expressions in $types and $keys. $types - regular expression matching the names of fields to be processed. ...