Creating a new namespace in mediawiki

Question

When I googled "create new namespace in mediawiki", I got this. I have created a new namespace using this technique and it worked perfectly. After that because of curiosity I searched in the mediawiki search bar for "Testnamespace:testpage" where "Testnamespace" namespace is not there in my wiki and got a link for creating a new page. So my question is :

Does this create a new namespace("Testnamespace") in the wiki without modifying LocalSettings.php with those codes in the above link?

Answer 1

No, you can't create a namespace without editing your wiki's configuration. If you create a page titled "A:B" where "A" is not a valid namespace, "A:B" will just be a page in main namespace (namespace 0).