checking value in XSL and substituing value

I am trying to tansform one xml into another using an xsl , how do I check for a particular value in the input xml and when that value occurs have an set value in the new xml

for example

input xml:

<Test>
<ones>
<one>Y</one>
<one>N</one>
</ones>
</Test>

When Y occurs , I want to set the value in the output xml to true

output xml:

<output>
 <transforms>
  <transform>true</transform>
  <transform>N</transform>
 </transforms>
<output>

the xsl snippet is currently

<xsl:element name="tansform" >
    <xsl:value-of select="Test/ones/one"/>  <!-- need to add logic here-->
 </xsl:element>