A URI identifies a resource either by location, or a name, or both. A URI has two specializations known as URL and URN. A Uniform Resource Locator (URL) is a subset of the Uniform Resource Identifier (URI) that specifies where an identified resource is available and the mechanism for retrieving it.URL defines how the resource can be obtained. It does not have to be HTTP URL (http://), a URL can also be (ftp://) or (smb://) A Uniform Resource Name (URN) is a Uniform Resource Identifier (URI) that uses the URN scheme, and does not imply availability of the identified resource. Both URNs (names) and URLs (locators) are URIs, and a particular URI may be both a name and a locator at the same time.

/aftp/xx.yy.edu/pub/doc/README Fig 1. Some alternative tagged and untagged representations

Malaria is transmitted by mosquitoes.

Axiom: Opacity of URIs The only thing you can use an identifier for is to refer to an object. When you are not dereferencing, you should not look at the contents of the URI string to gain other information.

Netzwerkgesellschaft revisited - Von den ersten Vernetzungsutopien zur Sharing Economy alternativ: Von der Netzwerkgesellschaft zum Plattformkapitalismus? Alternativ: