How I fetching value from XML with grouping conditions?

I want to fetching attribute value from XML with some conditions. I did not know how the group of values check in XPATH condition.

 Below is my XML format:

    <TTIDCData>
            <CYAccountHide HideTable="False">
        <fldAccountType Value="55" HideField="False" PrintValue="55" Description=""/>
        <fldActNumber Value="502100" HideField="False" PrintValue="502100"/>
    </CYAccountHide>
    <CYAccountHide HideTable="False">
        <fldAccountType Value="55" HideField="False" PrintValue="55" Description=""/>
        <fldActNumber Value="502200" HideField="False" PrintValue="502200"/>
    </CYAccountHide>

        <CYAccountHide HideTable="False">
        <fldAccountType Value="55" HideField="False" PrintValue="55" Description=""/>
        <fldActNumber Value="502201" HideField="False" PrintValue="502200"/>
    </CYAccountHide>
    <person name="blair" address="502100"/>
    <person name="blair" address="502200"/>
</TTIDCData>

 I want to value which is not match.
 Conditions is `//CYAccountHide/fldAccountType/@Value != //person/@address`

 But that condition does not work.

 Basically in my XML I have a value for `//CYAccountHide/fldAccountType/@Value` this attribute is `502100,502200,502201` and for `//person/@address` attribute have value is `502100,502200`. And I want to value with help of xpath is only `502201`

 If verify only one value then //CYAccountHide/fldAccountTyoe/@Value != '502100' this condition is work but I want verify group of value with that XML tag.

Thanks in an advance...

Thanks to all....