same CUI has different id ..why ??

[Prakash Poudyal]

Hello all,


<org.apache.ctakes.typesystem.type.refsem.UmlsConcept _id="111532"
codingScheme="SNOMED" code="142988001" oid="142988001#SNOMED"
cui="C0525032" tui="T059"/>


 <org.apache.ctakes.typesystem.type.refsem.UmlsConcept _id="111540"
codingScheme="SNOMED" code="165581004" oid="165581004#SNOMED"
cui="C0525032" tui="T059"/>

<uima.cas.FSArray _id="111548" size="2">
        <i>111540</i>
        <i>111532</i>
    </uima.cas.FSArray>


why,same cui="C0525032" has different _id="111532",   _id="111540"

can anybody tell what this _id represent for ?

With Best Regards
Prakash Poudyal
Portugal


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Regards
Prakash Poudyal