| The tld-extensionType is used to indicate
extensions to a specific TLD element.
It is used by elements to designate an extension block
that is targeted to a specific extension designated by
a set of extension elements that are declared by a
namespace. The namespace identifies the extension to
the tool that processes the extension.
The type of the extension-element is abstract. Therefore,
a concrete type must be specified by the TLD using
xsi:type attribute for each extension-element.
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