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When we write a xml based layout in Android we use the string "xmlns:android="http://schemas.android.com/apk/res/android".
From the books I read it says that this is a namespace, but why do we use this? The link doesn't even exist. So what is the use of this?
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One of the primary motivations for defining an XML namespace is to avoid naming conflicts when using and re-using multiple vocabularies. XML Schema is used to create a vocabulary for an XML instance, and uses namespaces heavily.
An XML Namespace has the properties: Namespace URI: Namespace name expressed as a URI to which the prefix is bound. prefix: syntactically, this is the part of the attribute name following the XMLConstants. XMLNS_ATTRIBUTE ("xmlns") in the Namespace declaration.
An XML namespace is a means of qualifying element and attribute names to disambiguate them from other names in the same document. This section provides a brief description of XML namespaces and how they are used in SOAP. For complete information, see http://www.w3.org/TR/REC-xml-names/
A namespace name is a uniform resource identifier (URI). Typically, the URI chosen for the namespace of a given XML vocabulary describes a resource under the control of the author or organization defining the vocabulary, such as a URL for the author's Web server.
From developer.android.com
xmlns:android
Defines the Android namespace. This attribute should always be set to "http://schemas.android.com/apk/res/android".
xmlns:android is for identification that this xml is used for android, not for other function.
Namespaces uniquely identify code/libraries. If I write an api that uses all the same names and such as the android api the only way to distinguish between my api and android api is to use the android namespace, or mine.
You can further refer http://en.wikipedia.org/wiki/XML_namespace
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