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  <li data-type="sect1">
    <a href="ch15.html#why_is_deprecation_so_hardquestion_mark">Why Is Deprecation So Hard?</a>
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  <li data-type="sect2">
    <a href="ch15.html#deprecation_during_design">Deprecation During Design</a>
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  <li data-type="sect1">
    <a href="ch15.html#types_of_deprecation">Types of Deprecation</a>
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  <li data-type="sect2">
    <a href="ch15.html#advisory_deprecation">Advisory Deprecation</a>
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  <li data-type="sect2"