+ <xsl:variable name="oclc_number">
+ <xsl:choose>
+ <xsl:when test='contains(tmarc:c001,"ocn") or
+ contains(tmarc:c001,"ocm") or
+ contains(tmarc:c001,"OCoLC") '>
+ <xsl:value-of select="tmarc:c001"/>
+ </xsl:when>
+ <xsl:when test='contains(tmarc:d035/tmarc:sa,"ocn") or
+ contains(tmarc:d035/tmarc:sa,"ocm") or
+ contains(tmarc:d035/tmarc:sa,"OCoLC") '>
+ <xsl:value-of select="tmarc:d035/tmarc:sa"/>
+ </xsl:when>
+ </xsl:choose>
+ </xsl:variable>
+