Wikipedia is an online encyclopedia that can be edited by anyone. It uses the wiki software MediaWiki and is governed by policies of neutral point of view, verifiability, and not including original research. The Wikimedia Foundation oversees Wikipedia and other wiki projects to support sharing knowledge freely.

1. Wikipedia
Konstantinos Stampoulis
Geraki

2. Five Pillars
Wikipedia is an online encyclopedia
Wikipedia has a neutral point of view
Wikipedia is free content that anyone can edit and distribute
Wikipedians should interact in a respectful and civil manner
Wikipedia does not have firm rules

3. Policy
●Wikipedia is not a paper encyclopedia
●Wikipedia is not a dictionary
●Wikipedia is not a publisher of original thought
●Wikipedia is not a soapbox or means of promotion
●Wikipedia is not a mirror or a repository of links, images, or
media files
●Wikipedia is not a blog, webspace provider, social networking,
or memorial site
●Wikipedia is not a directory
●Wikipedia is not a manual, guidebook, textbook, or scientific
journal
●Wikipedia is not a crystal ball
●Wikipedia is not an indiscriminate collection of information
●Wikipedia is not censored

4. Policy
●Wikipedia is not a democracy
●Wikipedia is not a bureaucracy
●Wikipedia is not a battleground
●Wikipedia is not an anarchy

5. Policy
●Neutrality
●Verifiability
●No original research

6. Policy-Copyright
Creative Commons
Attribution Sharealike 3.0
GNU Free Documentation
License 1.2

7. MediaWiki
MediaWiki is a popular free web-based wiki
software application.
It is developed by, and it runs, all the projects of the
Wikimedia Foundation, including Wikipedia,
Wiktionary, and Wikinews, as well as powering
many other wiki websites worldwide.
It is written in the PHP programming language and
uses a backend database.

8. MediaWiki

9. MediaWiki

10. MediaWiki
Page content is generated through the use of a
markup language and limited HTML.
Examples:
'''Bold''' : Bold
''Italics'' : Italics
[[Linux]] : link to article "Linux"
[http://www.gnu.org/ GNU Project] : External link

11. System architecture
Wikipedia currently runs on dedicated clusters of Linux
servers (mainly Ubuntu), with a few OpenSolaris
machines for ZFS. As of December 2009, there were
300 in Florida and 44 in Amsterdam

12. Wikimedia Foundation
http://wikimediafoundation.org

13. Wikimedia Foundation
Imagine a world in which every single human being
can freely share in the sum of all knowledge.
That's our commitment.

14. Wikimedia Foundation
Wikipedia
Wikisource
Wiktionary
Wikiquote
Wikispecies
Wikibooks
Wikinews
Wikiversity
Wikimedia Commons

15. Wikimedia Foundation
Wikimedia Chapters

16. el.wikipedia.org
ΒΙΚΙΠΑΙΔΕΙΑ
Η ελεύθερη εγκυκλοπαίδεια

17. el.wikipedia.org
> 55.690 articles
> 141.000 pages
> 2.490.000 edits

18. el.wikipedia.org
> 70.000 registered users
~ 670 active users
= 18 admins

19. el.wikipedia.org
Page views March 2010
= 12.900.000
= 430.000 /day
= 18.000 /hour
= 299 /min
= 5 /sec

20. el.wikipedia.org

21. el.wikipedia.org
ΒΙΚΙΠΑΙΔΕΙΑ
Η ελεύθερη εγκυκλοπαίδεια

22. Questions

23. Templates

24. No parameters:
{{mybox}}
Unnamed parameters:
{{mybox| 1 | 2 }}
Named parameters:
{{mybox| par1 = 1 | par2 = 2 }}

25. Template code:
You gave {{{1}}} and {{{2}}}.
Article code:
{{mybox| dog | cat }}
Article output:
You gave dog and cat.

26. Template code:
You gave {{{par1}}} and {{{par2}}}.
Article code:
{{mybox|
par1 = donkey |
par2 = mule }}
Article output:
You gave donkey and mule.

27. But what about defaults?

28. Template code:
You gave {{{par1|lion}}} and {{{par2|tiger}}}.
Article code:
{{mybox| par2 = mule }}
Article output:
You gave lion and mule.

29. Template code:
You gave {{{par1|{{{1}}} }}} and
{{{par1|{{{1|lion}}} }}}.
Article code:
{{mybox| tiger | par2 = mule }}
Article output:
You gave tiger and mule.

30. Template code:
{| class=”infobox”
| First name
| {{{par1|}}}
|-
| Last name
| {{{par2|}}}
|}
Article code:
{{mybox| par1 = King | par2 = Kong }}
Article output:
First name King
Last name Kong

31. Template code:
{| class=”infobox”
| First name
| {{{par1|}}}
|-
| Last name
| {{{par2|}}}
|}
Article code:
{{mybox| par1 = | par2 = Kong }}
Article output:
First name
Last name Kong

32. {{#if: test string | value if true | value if false }}
{{#if: {{{par1|}}} | value if true | value if false }}
Remember: When checking infobox parameters, default value
should always be empty (=false).

33. Template code:
{| class=”infobox”
{{#if: {{{par1|}}} |
{{!}} First name
{{!}} {{{par1}}}
}}
|-
{{#if: {{{par2|}}} |
{{!}} Last name
{{!}} {{{par2}}}
}}
|}
Article code:
{{infobox| par1 = | par2 = Kong }}
Article output:
Last name Kong

34. Nested functions:
{{#if: {{{par1|}}} | {{#if: {{{par2|}}} | true for
par2 | false for par2 }} | false for par1 }}

35. Article code:
{{Infobox person
| name =
| birth_date =
| birth_place =
| death_date =
| death_place =
| nationality =
| other_names =
| known_for =
| occupation =
}}

36. Template code:
{| class=”infobox”
{{#if: {{{name|}}} |
{{!}} Name
{{!}} {{{name}}}
}} Plain syntax:
|-
{{#if: {{{birth_date|}}} | Flexible but
{{!}} Birth date
{{!}} {{{birth_date}}} complex and
}}
|- difficult to maintain
{{#if: {{{birth_place|}}} |
{{!}} Birth place
{{!}} {{{birth_place}}}
}}
...
|}

37. META-TEMPLATES

38. Article code:
{{Infobox person
| name =
| birth_date =
| birth_place =
| death_date =
| death_place =
| nationality =
| other_names =
| known_for =
| occupation =
}}

39. Template code:
{{Infobox
|label1 = Name
|data1 = {{{name}}}
|label2 = Birth date
|data2 = {{{birth_date|}}}
|label3 = Birth place
|data3 = {{{birth_place|}}}
|label4 = Death date
|data4 = {{{birth_date|}}}
|label5 = Death place
|data5 = {{{birth_place|}}}
|label6 = Nationality
|data6 = {{{nationality|}}}
|label7 = Other names
|data7 = {{{other_names|}}}
|label8 = Occupation
|data8 = {{{occupation|}}}
}}

40. Template code:
{{Infobox
|label1 = Name
|data1 = {{{name}}}
← Obligatory parameter
|label2 = Birth date
|data2 = {{{birth_date|}}} ← Optional parameter
|label3 = Birth place
|data3 = {{{birth_place|}}}
|label4 = Death date
|data4 = {{{birth_date|}}}
|label5 = Death place
|data5 = {{{birth_place|}}}
|label6 = Nationality
|data6 = {{{nationality|}}}
|label7 = Other names
|data7 = {{{other_names|}}}
|label8 = Occupation
|data8 = {{{occupation|}}}
}}

41. Template code:
{| class=”infobox”
{{Infobox {{#if: {{{name|}}} |
|label1 = Name {{!}} Name
|data1 = {{{name}}}
{{!}} {{{name}}}
|label2 = Birth date
}}
|data2 = {{{birth_date|}}}
|label3 = Birth place |-
|data3 = {{{birth_place|}}} {{#if: {{{birth_date|}}} |
|label4 = Death date {{!}} Birth date
|data4 = {{{birth_date|}}} {{!}} {{{birth_date}}}
|label5 = Death place }}
|data5 = {{{birth_place|}}} |-
|label6 = Nationality {{#if: {{{birth_place|}}} |
|data6 = {{{nationality|}}} {{!}} Birth place
|label7 = Other names {{!}} {{{birth_place}}}
|data7 = {{{other_names|}}} }}
|label8 = Occupation ...
|data8 = {{{occupation|}}} |}
}}

42. Complex code can be used if needed:
| label6 = Μάζα
| data6 = {{#if:{{{mass|}}}|{{{mass}}} kg}}

43. Important parameters of meta-template “Infobox”:
● name - the name of the infobox – important for many features
● title - title that appears at the top of our box
● image – image to show on the top of our box
● headerD
● labelD
● dataD
Text to use in corresponding row.
Headers, labels and data items with the same D-value are
mutually exclusive; if all are defined, only header will be
displayed.
If data is not defined, label is not displayed.

47. Questions