internal function to test validity of a wikidepia domain and user,
a character value providing the name of the specific wikipedia user
a character value providing the language of the wikipedia page.The default value is "en" for "english language".
a list of four elements, the first is
takeOnlyFirst, a boolean indicating if the class of
user.name parameter is invalid,
for example vector, list, matrix..., and in that case, the only the first element is considered.
The second element is
test, an integer with value:
4 for invalid domain,
3 for an empty parameter user.name,
2 when Wikipedia does not have an user with this exact name,
0 for valid existing user.name.
The third element is
user, a vector containing the user name, the user identifier, and domain. If the user does not exist, this item is not created.
The last element,
warnMessage, is a vector of warning messages.
Avner Bar-Hen, Louise Baschet, Francois-Xavier Jollois, Jeremie Riou
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