MediaWiki:Apihelp-edit-param-md5
The MD5 hash of the $1text parameter, or the $1prependtext and $1appendtext parameters concatenated. If set, the edit won't be done unless the hash is correct.
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The MD5 hash of the $1text parameter, or the $1prependtext and $1appendtext parameters concatenated. If set, the edit won't be done unless the hash is correct.