What is the difference between a URL, a URI, and a URN?

What is the difference between a URL, a URI, and a URN?

I need to reference to a Unicode character with a URI. Following IANA references list multiple schemes and namespaces but do not mention anything about identifiers for the Unicode characters. Does ...

I'm trying to do a find all from a Word document for <v:imagedata r:id="rId7" o:title="1-REN"/> with namespace xmlns:v="urn:schemas-microsoft-com:vml" and I cannot figure out what on earth th...

I have read many articles about URIs, URLs and URNs, but I don't understand the diff in real examples. Could you take a few examples of URI and URL? I think http://stack.com/first/index.html?subm...

Is there a list of (all, non-custom) URL schemes? I thought that I just needed to search on google to find tons of answers, but it's probably wrong my (naive) question. If so, I will settle the (...

I somewhat understand that URNs are used to provide unique and location independent name for the resource. Yet I fail to see their usefulness and how exactly they work: a) In order for URN to real...

According to Wikipedia, urn:<NID>:<NSS> The leading urn: sequence is case-insensitive. <NID> is the namespace identifier, which determines the syntactic interpretation of ...

What's the difference between an URI, URL and URN? I have read a lot of sites (even Wikipedia) but I don't understand it. URI: http://www.foo.com/bar.html URL: http://www.foo.com/bar.html UR...

As recently as 2002 the IETF was recommending in RFC 3406 that we should use x- prefixes for URN namespaces we didn't want to register, e.g. urn:x-acme:foobar. Now that the IETF has deprecated the ...

I have an XML schema file which references a urn based location. Is there some way to resolve this into a url, or some way to actually read the file it refers to. <xs:include schemaLocation="ur...

I'm looking to either find or build a URN (Universal Resource Name) resolver, which would return 0 or more URIs for a given URN. For example: urn:fooid:6e8bc430-9c3a-11d9-9669-0800200c9a66:foo mi...

Does an official URN for the MIME type exist? Mozilla Firefox and other applications use notations like "urn:mimetype:text/plain" or "urn:mimetype:handler:text/plain". There are two problems with ...

I want to have JAXB-annotated classes which would be marshalled/unmarshalled to different XML namespaces. What I need is something like: <someRootElement xmlns="urn:my:ns1" xmlns:a="urn:my:ns...