y NUnit. PropertyAttribute provides a protected constructor
that takes the value of the property and sets the property name to the
name of the derived class. NUnit itself uses this facility: some of
it's specialized attributes are actually specializations of <b>PropertyAttribute</b>.

<p>Here's an example that creates a Severity property. It works
just like any other property, but has a simpler syntax and is type-safe.
A test reporting system might make use of the property to provide special reports.

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