Question

Using ruby 1.9.3 and Nokogiri (latest):

Given (no, I did not come up with this):

<root>
<subelement>
    <key>
          <var name="id">50</var>
          <var name="secondaryid">0</var>
     </key>
</subelement>
<subelement>
   <key>
          <var name="id">50</var>
          <var name="secondaryid">1</var>
   </key>
</subelement>
</root>

Return the parent element (<key>) which has a var element with name property equal to “id” and a value equal to 50 AND a var element with name property equal to “secondaryid” and a value equal to 0. Do not return the node with id=50 and secondaryid=1.

Obviously it’s going to be built off something along the lines of:

@doc.xpath(“//var[@name=’id’ and text()=50]”)

but I can’t figure out how to add another predicate that will match the name = “secondaryid” element too.

Answer 1

Not tested with Ruby, but this should do the trick.

//key[var[@name='id'] = '50'][var[@name='secondaryid'] = '0']