(1)The set of names in a naming system.
(2)A logical grouping of the names used within aprogram. Also calledname scope.
(3) Alibrary ofclasses in.NET.
(4)XML namespace: In XML, a namespace is a collection of names, identified by aURI reference, that are used in XML documents as element types andattributenames. In order for XML documents to be able to use elements and attributes that have the same name but come from different sources, there must be a way to differentiate between the markup elements that come from the different sources.
(5)DNS namespace: DNS is the name service provided by the Internet forTCP/IP networks. DNS is broken up intodomains, a logical organization of computers that exist in a largernetwork. The domains exist at different levels and connect in ahierarchy that resembles the root structure of a tree. Each domain extends from thenode above it, beginning at the top with the root-level domain. Under the root-level domain are thetop-level domains, under those are the second-level domains, and on down intosubdomains.DNS namespace identifies the structure of the domains that combine to form a completedomain name. For example, in the domain name sub.secondary.com, “com” is the top-level domain, “secondary” identifies the secondary domain name (commonly a site hosted by an organization and/or business), and “sub” identifies a subdomain within the larger network. This entire DNS domain structure is called the DNS namespace. The name assigned to a domain or computer relates to its position in the namespace.
