Comparing 2 xml's and get the matching field's values

Hello,
I am having 2 xml's say...dsg.xml and my.xml
as
dsg.xml
---------
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE dsg SYSTEM "dsg.dtd">

<DBCSSCHEMA>
<TABLE name="t_fbpe_part_earn" shortname="fbpe">
<FIELDLIST>
<FIELD name="clnt_id_n" type="int" />
<FIELD name="ssn_n" type="char" default1="' '" />
<FIELD name="earn_rcvd_ts" type="datetime" default1="' '"/>
<FIELD name="earn_type_c" type="char" default1="' '"/>
<FIELD name="pay_prd_end_d" type="datetime" default1="' '"/>
<FIELD name="earn_q" type="float" default1="' '"/>
<FIELD name="data_src_type_c" type="char" default1="' '"/>
<FIELD name="rec_upd_type_c" type="char" default1="' '"/>
<FIELD name="rec_upd_ts" type="datetime" default1="getdate()" />
<FIELD name="rec_upd_user_nm" type="char" default1="XYZ" />
</FIELDLIST>

</TABLE>

<TABLE name="t_fpaa_activity" shortname="fpaa">
<FIELDLIST>
<FIELD name="clnt_id_n" type="int" />
<FIELD name="ssn_n" type="char" default1="' '" />
<FIELD name="earn_rcvd_ts" type="datetime" default1="' '"/>
<FIELD name="earn_type_c" type="char" default1="' '"/>
<FIELD name="benf_c" type="char" default1="' '"/>
<FIELD name="pay_prd_end_d" type="datetime" default1="' '"/>
<FIELD name="rec_upd_ts" type="datetime" default1="getdate()" />
</FIELDLIST>

</TABLE>

and my.xml as
-------

<?xml version="1.0" ?>
<!DOCTYPE workbook SYSTEM "workbook.dtd">

<workbook>
<sheet>
<name value="tbcc"/>
<row number="0">
<col number="0" field="Create new calculation using Calc Creator tool"></col>
<col number="1" field="See modCalcCreator in Calc Creator for instructions on data for fields."></col>
</row>
<row number="1">
<col number="0" field="t_tbcc_benf_calc_creator"></col>
<col number="1" field="clnt_id_n"></col>
<col number="2" field="db_plan_n"></col>
<col number="3" field="ssn_n"></col>
<col number="4" field="benf_c"></col>
<col number="5" field="plan_feat_c"></col>
<col number="6" field="bcd_d"></col>
<col number="7" field="benf_pmt_a"></col>
<col number="8" field="benf_calc_c"></col>
<col number="9" field="srvr_ben_pmt_a"></col>
<col number="10" field="pmt_stop_d"></col>
<col number="11" field="pmt_stop_rsn_c"></col>
<col number="12" field="svc_qty_q"></col>
<col number="13" field="ben_elig_d"></col>
<col number="14" field="nxt_pmt_adj_a"></col>
<col number="15" field="nxt_pmt_adj_d"></col>
<col number="16" field="srvr_pmt_adj_a"></col>
<col number="17" field="acru_benf_a"></col>
</row>
<row number="2">
<col number="0" field="(Link to Calc Creator)"></col>
<col number="1" field="15180"></col>
<col number="2" field="001"></col>
<col number="3" field="236-64-6709"></col>
<col number="4" field="1001"></col>
<col number="5" field="1"></col>
<col number="6" field="8/7/91"></col>
<col number="7" field="1032.59"></col>
<col number="8" field="2"></col>
<col number="10" field="21/9/99"></col>
</row>
<row number="3">
<col number="0" field="xyz"></col>
<col number="1" field="15180"></col>
<col number="2" field="001"></col>
<col number="3" field="236-64-6666"></col>
<col number="4" field="1001"></col>
<col number="5" field="1"></col>
<col number="6" field="8/7/91"></col>
<col number="7" field="1032.59"></col>
<col number="8" field="2"></col>
<col number="10" field="21/9/99"></col>
</row>
</sheet>
<sheet>
<name value="Sheet2"/>
</sheet>
<sheet>
<name value="Sheet3"/>
</sheet>
</workbook>

Now what I want is...compare these 2 xml's...In this, if for table 't_fpaa_activity'...clnt_id_n & ssn_n are matching with my.xml. Now what I want in my result is, the values of these 2 fields...ie.,
15180, 236-64-6709
15180, 236-64-6666 (ie., 2 separate records)
Can anyone please help me in this regard.
I used 2 classes, which reads these 2 xml's separately. But matching is where I am facing problem.
Thanks in advance