Reading xml file extracting value for a tag and compare it against a value

Hi,
I am very new to shell scripting and i want to do following
read a xml file to extract value of <not_matched> tag,
from each of <SQL_Analysis>,<Data_Analysis>,<Graph_Analysis>,<Excel_Analysis>,<Pdf_Analysis> tags and compare it against a some value and depending on the result say Pass or Fail.

Any help much appreciated.

XML file as below :
<Execution_Stats>
      <Total_Executions>1</Total_Executions>      
      <Total_Errors>0</Total_Errors>
      <SQL_Analysis>
            <NOT_COMPARED>1</NOT_COMPARED>
            <MATCHED>0</MATCHED>
            <NOT_MATCHED>0</NOT_MATCHED>
            <ERROR>0</ERROR>
      </SQL_Analysis>
      <Data_Analysis>
            <NOT_COMPARED>0</NOT_COMPARED>
            <MATCHED>0</MATCHED>
            <NOT_MATCHED>1</NOT_MATCHED>
            <ERROR>0</ERROR>
      </Data_Analysis>
      <Graph_Analysis>
            <NOT_COMPARED>1</NOT_COMPARED>
            <MATCHED>0</MATCHED>
            <NOT_MATCHED>0</NOT_MATCHED>
            <ERROR>0</ERROR>
      </Graph_Analysis>
      <Excel_Analysis>
            <NOT_COMPARED>1</NOT_COMPARED>
            <MATCHED>0</MATCHED>
            <NOT_MATCHED>0</NOT_MATCHED>
            <ERROR>0</ERROR>
      </Excel_Analysis>
      <Pdf_Analysis>
            <NOT_COMPARED>1</NOT_COMPARED>
            <MATCHED>0</MATCHED>
            <NOT_MATCHED>0</NOT_MATCHED>
            <ERROR>0</ERROR>
      </Pdf_Analysis>
</Execution_Stats>