ll add support for default arguments and we'll gradually refine the
implementation with syntax improvements.  Finally we'll show how to
streamline the implementation of named parameter interfaces,
improve their participation in overload resolution, and optimize
their runtime efficiency. -->
<div class="section" id="headers-and-namespaces">
<h3>2.1.1&nbsp;&nbsp;&nbsp;Headers And Namespaces</h3>
<p>Most components of the Parameter library are declared in a
header named for the component.  For example,</p>
<pr