Get Unmatched record using xpath expression in c#

hi ,

var temp = xdocfile.xpathselectelements("//ref[label/text()=translate(@id, 'abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz', '')]");

i want unmatch records using above xpath equation

can please tell me possible ?

in below example,

id , label compulsory,need search unmatched records 

input:

<ref id="sec1">see fig test
  <label>1</label>
</ref>

<ref id="temp34">see fig test
  <label>3</label>
</ref>

<ref id="sec4">see fig test
</ref>

<ref sub="sec4">see fig test </ref>

<ref id="4test">see fig test
  <label>4</label>
</ref>

output:

<ref id="temp34">see fig test
  <label>3</label>
</ref>

<ref id="4test">see fig test
  <label>4</label>
</ref>

i got right expresion:

var varsearchterm = from x in xdocfile.xpathselectelements("
//ref[@id , label][translate(@id, '.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz', '')!=translate(./label/text(),'.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz','.abcdefghijklmnopqrstuvwxyzabcdefghijklmnopqrstuvwxyz')]
") select x;

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