Chapter Author and Editors
Capture each author or editor contributor in a <contrib>
        element child of <contrib-group>
<book-part-meta>.Each <contrib> must have a @contrib-type
            attribute. The only allowed values for this attribute are author
 or
            editor
.
Each <contrib> representing an author or an editor must have a
            child <name> element. Capture the contributors surname and given
            name(s) in child <surname> and
                <given-name> elements respectively. 
The name element must contain a @name-style attribute. If the contributor
            has their name presented in the order given-name, surname then use western
 as the
            value. If the contributor has their name presented in the order surname, given name then
            use eastern
 as the value.
If a contributor has any associated affiliation, footnote or biography information those
            must be explictly linked using an <xref> element. See Contributor Cross References.
Example
<contrib contrib-type="author">
  <name name-style="western">
    <surname>McGurn</surname>
    <given-names>Arthur R</given-names>
  </name>
  <xref ref-type="aff" rid="bk978-0-7503-3579-9aff1"/>
  <xref ref-type="bio" rid="bk978-0-7503-3579-9bio1"/>
</contrib>