In XML, xmlns declares a Namespace. In fact, when you do: Instead of calling android:id, the xml will use http://schemas.android.com/apk/res/android:id to be unique. Generally this page doesn’t exist (it’s a URI, not a URL), but sometimes it is a URL that explains the used namespace. The namespace has pretty much the same uses as the package name in … Read more
Namespace related attributes in XML and XML Schema (XSD) xmlns is part of the W3C Namespaces in XML Recommendation:The prefix xmlns is used only to declare namespace bindings and is by definition bound to the namespace name http://www.w3.org/2000/xmlns/.In your example, it declares that http://maven.apache.org/POM/4.0.0 is the default namespace for the elements in your Maven project. xmlns:xsi declares a standard namespace prefix (xsi) for … Read more
It defines an XML Namespace. In your example, the Namespace Prefix is “android” and the Namespace URI is “http://schemas.android.com/apk/res/android“ In the document, you see elements like: <android:foo /> Think of the namespace prefix as a variable with a short name alias for the full namespace URI. It is the equivalent of writing <http://schemas.android.com/apk/res/android:foo /> with regards to what it “means” when an XML … Read more