Need help in xPath

[sankara]

I am having a XML document like this:
<?xml version="1.0"?>
  <id value="229">
        <objecttype>57</objecttype>
        <name>File 1</name>
        <createdby>xxx</createdby>
        <createdon>05-03-2003</createdon>
        <modifiedby>zzz</modifiedby>
        <modifiedon>05-03-2003</modifiedon>
        <expirydate />
        <deleted />
        <active>N<active/>
        <searchable />
        <checkedout>n</checkedout>
        <checkedoutto>noone</checkedoutto>
  </id>

What is the xPath query for selecting XML documents with
objecttype as 57 and active as Y ?

-Sankaran