Multiple Title Tags

I've dug through the XHTML Recommendation and found that apparently only a
single title tag set is allowed (and required) within the head of a given
HTML document.  There is a person who recommends using several such tags for
marketing reasons.  Anyone have an opinion on this?

............................

W3C XHTML 1.0 Strict Recommendation snippet:

<!--StartFragment--><!ENTITY % head.misc "(script|style|meta|link|object)*">

<!-- content model is %head.misc; combined with a single
     title and an optional base element in any order -->

<!ELEMENT head (%head.misc;,
     ((title, %head.misc;, (base, %head.misc;)?) |
      (base, %head.misc;, (title, %head.misc;))))>

<!ATTLIST head
  %i18n;
  profile     %URI;          #IMPLIED
  >

<!-- The title element is not considered part of the flow of text.
       It should be displayed, for example as the page header or
       window title. Exactly one title is required per document.
    -->
<!ELEMENT title (#PCDATA)>
<!ATTLIST title %i18n;>

.............................

Thanx,

D

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