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//! [0]
myInstance = QXmlNodeModelIndex();
//! [0]
//! [1]
QFile queryFile(argv[1]);
QFile chemistryData(argv[2]);
QString moleculeName = argv[3];
QXmlQuery query;
query.setQuery(&queryFile, QUrl::fromLocalFile(queryFile.fileName()));
ChemistryNodeModel myNodeModel(query.namePool(), chemistryData);
QXmlNodeModelIndex startNode = myNodeModel.nodeFor(moleculeName);
query.bindVariable("queryRoot", startNode);
QFile out;
out.open(stdout, QIODevice::WriteOnly);
QXmlSerializer serializer(query, &out);
query.evaluateTo(&serializer);
//! [1]
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