 exceptions are handled.
  </P>

  <P>
    URLs given to any of the functions below are first resolved with
    respect to the current working directory and stripped of their query
    and fragment constituents.
  </P>

  <P>
    The structure <TT>ComponentManager</TT> is the root component manager.
    User-defined managers can be created through the
    <a href="component.html#MkManager"><TT>Component.MkManager</TT></A>
    or the
    <a href="sandbox.html#MkManager"><TT>Sandbox.MkManager</TT></A> functor