Abstract:
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Checkwiki helps clean up syntax and other errors in the source code of Wikipedia by finding and fixing problems such as:

* Eliminating errors in the wiki syntax, such as missing close tags or brackets;
* Checking for accessibility issues, such as small print or heading problems;
* Correcting, deleting or moving code that does not follow conventions, such as the position of references with respect to punctuation;
* Finding articles that have invalid ISBNs

License
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GPL3 license

URLs:
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Check Wikipedia runs at:
https://tools.wmflabs.org/checkwiki/

The full documentation can be found at:
https://en.wikipedia.org/wiki/Wikipedia:WikiProject_Check_Wikipedia