XSLT template to remove empty attributes from the xml.

<xsl:template match="/">
  <xsl:copy>
     <xsl:apply-templates>
       <xsl:for-each select="@*">
          <xsl:if test=".!=''">
             <xsl:copy-of select="." />
          </xsl:if>
       </xsl:for-each>
     </xsl:apply-templates>
   </xsl:copy> 
</xsl:template>

XSLT template to reorder the elements as per the position. The order option allows you to decide the order of sort. Depending on the select XPath query result data-type can be given.

<xsl:template match="*">
    <xsl:copy>
       <xsl:apply-templates>
          <xsl:sort select="position()"order="descending" data-type="number" />
       </xsl:apply-templates>
     </xsl:copy>
  </xsl:template>

XSLT template to just copy all elements without any condition from one file to another.

<xsl:template match="* | @*">
           <xsl:copy>
              <xsl:copy-of select="@*" />
              <xsl:apply-templates />
           </xsl:copy>
        </xsl:template>