XSLT 1.0 - 之后的冗余节点 <xsl :if test ..> 条件

Question

I have an xslt file like below ;

<xsl:if test="/ItemList/Item/cx">
            <kml:Circle>

           </kml:Circle>

</xsl:if>
<xsl:if test="/ItemList/Item/Lon">
            <kml:Point>

          </kml:Point>

</xsl:if>

After executing this xslt on a xml file like the following , it generates redundant tags like <kml:Point/> and <kml:Circle/> . But I do not want this tag.

Sample XML File

<ItemList>
  <Item>
    <Name>1</Name>
    <Lon>66.406180329538</Lon>
    <Lat>35.7185924672465</Lat>

  </Item>
  <Item>
    <Name>2</Name>
    <cx>1</cx>
    <cy>2</cy>
    <rx>3</rx>
    <ry>4</ry>
  </Item>
</ItemList> 

After executing xslt on this file sample output is like following ;

<kml:Placemark>
<kml:Circle cx="1" cy="2" r="3"/>
<kml:Point/>
</kml:Placemark>

<kml:Placemark>
<kml:Circle/>
<kml:Point>
<kml:coordinates>68.406180329538,35.7185924672465</kml:coordinates>
</kml:Point>
</kml:Placemark>

My question is , why there are nodes like <kml:Point/> and <kml:Circle/> after executing this xslt. I do not want this redundant nodes.

Thanks for your help

Answer 1

This XPath expression /ItemList/Item/cx is an absolute location path and it doesn't depend on the context node that had matched the rule on your transformation. In short, it will always select the same nodes, thus it will always have the same boolean value.

Because your input document has both a cx and a Lon element (in different branch, but they both exist) your xsl:if instructions content will be processed.