[/==============================================================================
    Copyright (C) 2001-2011 Hartmut Kaiser
    Copyright (C) 2001-2011 Joel de Guzman

    Distributed under the Boost Software License, Version 1.0. (See accompanying
    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
===============================================================================/]

[/------------------------------------------------------------------------------]
[section XXX]

[heading Description]

Description of XXX concept

[heading Refinement of]

[:Link to base concept]

[variablelist Notation
    [[`xxx`]     [An XXX]]
]

[heading Valid Expressions]

(For any XXX the following expressions must be valid:)

In addition to the requirements defined in _XXX-Basic_concept_, for any
XXX the following must be met:

[table
    [[Expression]       [Semantics]             [Return type]]
    [[`xxx`]            [Semantics of `xxx`]    [XXX]]
]

[heading Type Expressions]

[table
    [[Expression]       [Description]]
    [[`XXX`]            [Description of `XXX`]]
]

[heading Invariants]

For any XXX xxx the following invariants always hold:

[heading Precondition]

Prior to calling FOO the following preconditions should hold:

[heading Precondition]

Upon return from FOO the following postconditions should hold:

[heading Models]

Links to models of XXX concept

[endsect] [/ XXX Concept]