<xsl:choose>

    <xsl:choose>

    <xsl:when test="marc:datafield[@tag=100] or marc:datafield[@tag=110] or marc:datafield[@tag=111] or marc:datafield[@tag=700] or marc:datafield[@tag=710] or marc:datafield[@tag=711]">

    <xsl:when test="marc:datafield[@tag=100] or marc:datafield[@tag=110] or marc:datafield[@tag=111] or marc:datafield[@tag=700] or marc:datafield[@tag=710] or marc:datafield[@tag=711]">

    <p class="author">by

    <p class="author">by

        <xsl:for-each select="marc:datafield[(@tag=100 or @tag=700 or @tag=110 or @tag=710 or @tag=111 or @tag=711) and @ind1!='z']">

        <xsl:for-each select="marc:datafield[(@tag=100 or @tag=700 or @tag=110 or @tag=710 or @tag=111 or @tag=711) and @ind1!='z']">

            <a>

            <a>

                <xsl:choose>

                <xsl:choose>