Declaring Namespaces and Namespace Association
XML in general is very sensitive to namespaces, and XAML is no different. Several namespaces are critical, including workflow-related namespaces and namespaces associated with .NET itself.
The primary namespace your XAML file must include is http://schemas.microsoft.com/winfx/2006/xaml, which customarily uses the prefix x. In XML, the namespace declaration looks like this:
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Workflow-based XAML files must also include the workflow namespace, http://schemas.microsoft.com/winfx/2006/xaml/workflow. If there is a namespace prefix, by convention it will be wf, but in workflow-based XAML files you typically make the workflow namespace the default namespace ...
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