How can i do a query?

Question

hello,
i've insert my xml documents in my table ,
and now i want to do queries to see if the data is correct or no,
how can i do it?
i will put a small example of my xml document, and i want to have a query example for this docuemts. thanks:
<?xml version="1.0" encoding="UTF-8" ?>
<ENZYME>
<ID>
<EcNumberID>1.1.1.104</EcNumberID>
</ID>
<PROTEIN>
<PR>
<NumberPR>1</NumberPR>
<NamePR>Oryctolagus cuniculus</NamePR>
<LiteraturePR>1</LiteraturePR>
</PR>
</PROTEIN>
<RECOMMENDED_NAME>
<RN>
<NameRN>4-oxoproline reductase</NameRN>
</RN>
</RECOMMENDED_NAME>
<SYSTEMATIC_NAME>
<NameSN>4-hydroxy-L-proline:NAD+ oxidoreductase</NameSN>
</SYSTEMATIC_NAME>
<SYNONYMS>
<SY>
<NombreSY>hydroxy-L-proline oxidase</NombreSY>
</SY>
</SYNONYMS>
<CAS_REGISTRY_NUMBER>
<CR>
<NumberCR>37250-37-6</NumberCR>
</CR>
</CAS_REGISTRY_NUMBER>
<REACTION>
</REACTION>
<REACTION_TYPE>
<RT>
<NombreRT>redox reaction</NombreRT>
</RT>
<RT>
<NombreRT>oxidation</NombreRT>
</RT>
<RT>
<NombreRT>reduction</NombreRT>
</RT>
</REACTION_TYPE>
<SOURCE_TISSUE>
<ST>
<NombreST>kidney</NombreST>
<OrganismST>Oryctolagus cuniculus</OrganismST>
<LiteratureST>1</LiteratureST>
</ST>
</SOURCE_TISSUE>
<NATURAL_SUBSTRATE_PRODUCT>
<NombreNSP>
<NombreNSP>4-oxo-proline + NADH = 4-hydroxy-L-proline + NAD+</NombreNSP>
<OrganismNSP>Oryctolagus cuniculus</OrganismNSP>
<LiteratureNSP>1</LiteratureNSP>
</NombreNSP>
</NATURAL_SUBSTRATE_PRODUCT>
<SUBSTRATE_PRODUCT>
<SP>
<NombreSP>4-oxoproline + NADH = 4-hydroxy-L-proline + NAD+</NombreSP>
<OrganismSP>Oryctolagus cuniculus</OrganismSP>
<LiteratureSP>1</LiteratureSP>
</SP>
<SP>
<NombreSP>4-oxo-proline + NADH = 4-hydroxy-L-proline + NAD+</NombreSP>
<OrganismSP>Oryctolagus cuniculus</OrganismSP>
<LiteratureSP>1</LiteratureSP>
</SP>
</SUBSTRATE_PRODUCT>
<KM_VALUE>
<KM>
<ValueKM>0.6</ValueKM>
<SubstrateKM>4-Oxoproline</SubstrateKM>
<OrganismKM>Oryctolagus cuniculus</OrganismKM>
<LiteratureKM>1</LiteratureKM>
</KM>
<KM>
<ValueKM>0.84</ValueKM>
<SubstrateKM>NADH</SubstrateKM>
<OrganismKM>Oryctolagus cuniculus</OrganismKM>
<LiteratureKM>1</LiteratureKM>
</KM>
</KM_VALUE>
<PH_OPTIMUM>
<PHO>
<ValuePHO>6</ValuePHO>
<ValueMaxPHO>6.5</ValueMaxPHO>
<OrganismPHO>Oryctolagus cuniculus</OrganismPHO>
<CommentaryPHO>
<Comentary> decrease of activity below pH 6.0 (1)</Comentary>
</CommentaryPHO>
<LiteraturePHO>1</LiteraturePHO>
</PHO>
</PH_OPTIMUM>
<SPECIFIC_ACTIVITY>
<SA>
<ValueSA>5.21</ValueSA>
<OrganismSA>Oryctolagus cuniculus</OrganismSA>
<LiteratureSA>1</LiteratureSA>
</SA>
</SPECIFIC_ACTIVITY>
<COFACTOR>
<CF>
<NombreCF>NADH</NombreCF>
<OrganismCF>Oryctolagus cuniculus</OrganismCF>
<LiteratureCF>1</LiteratureCF>
</CF>
</COFACTOR>
<PURIFICATION>
<PU>
<OrganismPU>Oryctolagus cuniculus</OrganismPU>
<CommentaryPU>ammonium sulfate, negative alumina gel, positive alumina gel</CommentaryPU>
<LiteraturePU>1</LiteraturePU>
</PU>
</PURIFICATION>
<STORAGE_STABILITY>
<SS>
<OrganismSS>Oryctolagus cuniculus</OrganismSS>
<CommentarySS>-10C, 160 mM phosphate buffer, pH 6.0, 3 months, no loss of     activity</CommentarySS>
<LiteratureSS>1</LiteratureSS>
</SS>
</STORAGE_STABILITY>
<REFERENCE>
<RF>
<NumberRF>1</NumberRF>
<ReferenceRF> Smith, T.E.; Mitoma, C.: Partial purification and some properties     of 4-ketoproline reductase. J. Biol. Chem. (1962) 237, 1177-1180.     {Pubmed:}</ReferenceRF>
</RF>
</REFERENCE>
</ENZYME>

Answer 1

no body can hekp me??
i put another example of my xml document how is smaller than the other, please helpme.
<ENZYME>
<ID>
<EcNumber>1.1.1.1</EcNumber>
</ID>
<PROTEIN>
<PR>
<Number>1</Number>
<Name>Gallus gallus</Name>
<Commentary>
<Coment> isoenzyme C2 (48)</Coment>
<Coment> isozyme ADH4 (118)</Coment>
</Commentary>
<Literature>44</Literature>
</PR>
</PROTEIN>
</ENZYME>