ORO Walk through prefaces

Capture walk through prefaces to the book using a miscMatter with attribute class="walkthrough".

Walk Through Preface XML


      <miscMatter class="walkthrough" id="acref-9780199677337-miscMatter-13" doi="10.1093/acref/9780199677337.002.0013" isChunk="yes">
        <titleGroup id="acref-9780199677337-miscMatter-13-titleGroup-48"><title>
 <p>Notes on Using this Companion</p></title>
        </titleGroup>
        <textMatter><div1 id="acref-9780199677337-miscMatter-13-div1-12" doi="10.1093/acref/9780199677337.002.0013.021.0012" role="prelim">
 <p>This Companion has been written with the intention that browsing through it should be
              a pleasure. However, most readers are likely to use it in the first instance for
              looking up a particular topic.</p>
 <p>To look something up, the first step, is to see if it is an entry. <span display="print">The 2,717 entry headwords, printed so that they stand out clearly on
                the page, are in alphabetical sequence. (Note that spaces between words are ignored,
                so that <sc>aardvark</sc> comes before <sc>à la</sc>.)</span>
                     </p></div1>
        </textMatter>
      </miscMatter>