Semantic MediaWiki/Introduction

Overview

Currently this is only a collection of links with question that were recorded while tomaschwutz was looking at this topic in 2012. See also the Semantic MediaWiki category.

Big pictures

• What is it all about?
• What is it good for?
• Why is agreeing on common editing syntax advantages?
  • Introduction

• What are the benefits compared to using categories?

• Skim through the theorethical background.
  • Ontologies and the Semantic Web

Making use of the semantic data

• What is the factbox?
• What is a semantic browser
  • Browsing interfaces
  • example site

• What is a semantic query?
  • example
    • Task: Find all people from Germany and their cities and states
    • property names can be found on e.g. on a user factbox
  • Semantic search

Providing the semantic data

• How do I edit the semantic data?
• How to I specify the type of a property?
  • Properties and types
  • unfortunately does not work on wikiversity: Berlin Germany
    • edit the notes of user Carl Berlin on referata, and revert your changes using the history.

• How can you automaticall convert units?
  • e.g. Property:Area
  • Custom units

• What are Semantic templates good for?
  • e.g. California
  • background: m:Help:A quick guide to templates

• See how easy and powerful Service links can be used.

Semantic Forms

• See how you can use Semantic Forms to
  • design Categories, Properties, Templates, and Forms

• How can you use #arraymap to define multiple properties?

  {{#arraymap:{{{author|}}}|,|x|[[Has author::x]]}}

  • Why to use a space ( ) when defining categories?

  {{#arraymap:{{{categories|}}}|,|x|[[Category:x]]| }}

• What is the syntax of form fields?
  • How do you use autocompleting?
  • How can you use a Category for autocompletion?

    |values from category=Area of focus

  • How can you allow multiple inputs (seperated by commata)

    |list

  • How can force the user to input values?

    |mandatory

  • How can you have multiple instance of one template?

    {{{for template|Occupation|multiple|add button text=Add another occupation}}}

  • How can the user select from a category tree?
    • mw:Extension:CategoryTree must be installed.

• How you can use Maps?

More on semantic queries

• Here you look closer on Semantic search

• Selecting pages
  • Why is it important to specify a < directly after the double collon?
    • How do you compare text alphabetically?
  • Howe do you use the + wildcard symbol?
    • Pages of which namespace are selected by [[Help:+]]?
  • Does [[born in::!Boston]] query return results of pages that do not have the bon in property?
  • How do you use OR and ||?
    • What does [[Brazil||France||User:John Doe]] mean?
  • How do you use <q> and </q> for subqueries?
• What does [[Category:Cities]] [[located in.member of::European Union]] mean?

• Displaying information
  • ? does not restict results compared to query descriptions
  • use the empty format # do suppress all formatting and linking in subqueries
  • What are #cm, #-n, #-u and #ISO used for?
  • What are [output formats] fromat=count, csv, template, ul used for?

• Inline queries
  • explain the meaning of the following

{{#ask: [[Category:City]] [[located in::Germany]]
| ?population
| ?area#km² = Size in km²
}}

• • use {{#show: Berlin | ?population}} to show a single value
  • What is the meaning of the following parameters?
    • limit, sort, order, align, default,
  • |limit=0 |searchLabel=Click to browse

• How do you use Concepts
  • to define overview pages
  • to define dynamic categroies that can be used in further queries

• How can you Query linked properties?

Inferencing

• deducing new knowledge from entered information
• Subcategories and subproperties
  • Why is it important to describe the exact meaning of a category or a property very clearly?
  • :: returns subCategories, : not

Practicing

• scratchpad.referata
  • server often not reachable
  • twutz/reh