The stylesheet templates for xqx:moduleImport and xqx:schemaImport
both have the construct


    <xsl:if test="xqx:targetLocation">
      <xsl:text> at </xsl:text>
      <xsl:call-template name="quote">
        <xsl:with-param name="item" select="xqx:targetLocation"/>
      </xsl:call-template>
    </xsl:if>


which has the effect that if there are multiple xqx:targetLocation (as allowed by the schema, and the XQuery EBNF) then all but the first are quietly dropped.

I suggest replacing this in both cases by

<xsl:apply-templates select="xqx:targetLocation"/>

and adding


<xsl:template match="xqx:targetLocation">
  <xsl:choose>
   <xsl:when test="position()=1"> at </xsl:when>
   <xsl:otherwise>, </xsl:otherwise>
  </xsl:choose>
    <xsl:call-template name="quote">
      <xsl:with-param name="item" select="."/>
    </xsl:call-template>
</xsl:template>

David