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I understand this question is quite pedant-prone but I like to have information sorted out the right way. Anyway, after reading a post on Stackoverflow about difference between URL, URI and URN, I was directed to this paper: https://www.w3.org/TR/uri-clarification/

And it seems to me after reading that the wording URI scheme is correct, but URL/URN/... scheme is incorrect, that "http:", "isbn:" and the likes are really just namespaces and not schemes. But I googled a little and read URL scheme several times. I'm confused, since I'm not a native maybe I understand the document wrong.

Sheed
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IETF

The IETF calls them URI schemes.

Reference: section 3.1 in IETF’s URI standard (bold emphasis mine):

The process for registration of new URI schemes is defined […]

(In the past, they also used other terms, e.g. URL scheme names.)

WHATWG

The WHATWG calls them URL schemes.

Reference: section 4.1. in WHATWG’s URL standard (bold emphasis mine):

A URL’s scheme is an ASCII string that identifies the type of URL and […]

No surprises here, because the IETF recommends to use the term URI, while the WHATWG recommends to use the term URL. Details in this answer.

The term namespace is, for example, used for certain parts of URNs (i.e., URLs/URIs with the urn scheme).

unor
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  • so in the end it all revolves around the confusion between uri and url? or since every url are uri, it's not wrong to talk about uri scheme in case of "url scheme" – Sheed Oct 14 '17 at 18:45