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X

XAML

Extensible Application Markup Language (XAML) is a declarative XML-based language.

It is used by the Windows Presentation Foundation (WPF) as a user interface markup language to define UI elements, data binding, and events.

xmlns

XML namespaces are used for providing uniquely named elements and attributes in an XML document.

An XML instance may contain element or attribute names from more than one XML vocabulary. If each vocabulary is given a namespace, the ambiguity between identically named elements or attributes can be resolved.

A simple example would be to consider an XML instance that contained references to a customer and an ordered product. Both the customer element and the product element could have a child element named id. References to the id element would therefore be ambiguous; placing them in different namespaces would remove the ambiguity.