Query, Xquery

Question

I'm an italian student and I need your help:
I have the following xml document that is called tiny5_LTQ-FT.mzML0.99.1.xml :
<?xml version="1.0" encoding="ISO-8859-1"?>
<!-- edited with XMLSPY v5 rel. 4 U (http://www.xmlspy.com) by Twana Johnson (Institute for Systems Biology) -->
<mzML xmlns="http://psi.hupo.org/schema_revision/mzML_0.99.1" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://psi.hupo.org/schema_revision/mzML_0.99.1 mzML0.99.1.xsd" accession="" id="urn:lsid:psidev.info:mzML.instanceDocuments.tiny1" version="0.99.1">
     <cvList count="1">
          <cv cvLabel="MS" fullName="Proteomics Standards Initiative Mass Spectrometry Ontology" version="2.0.2" URI="http://psidev.sourceforge.net/ms/xml/mzdata/psi-ms.2.0.2.obo"/>
     </cvList>
</mzML>
I want to select the value of the cv attribute but
-if I write doc ('dbxml:/container1.dbxml/tiny4_LTQ-FT.mzML0.99.1.xml')/*/*/*/ @ fullName it returns the exact result!
-if I write doc ('dbxml:/container1.dbxml/tiny4_LTQ-FT.mzML0.99.1.xml')/mzML/cvList/cv/@ fullName it doesn't indicate errors but the resultset remains empty
it's just an example, my document is very long and I can't use the wild cards to interrogate him.
the following class makes it:
package searchmzml2;
import com.sleepycat.dbxml.XmlDocument;
import com.sleepycat.dbxml.XmlDocumentConfig;
import com.sleepycat.dbxml.XmlManagerConfig;
import com.sleepycat.dbxml.XmlQueryExpression;
import com.sleepycat.dbxml.XmlContainer;
import com.sleepycat.dbxml.XmlException;
import com.sleepycat.dbxml.XmlInputStream;
import com.sleepycat.dbxml.XmlManager;
import com.sleepycat.dbxml.XmlUpdateContext;
import com.sleepycat.dbxml.XmlQueryContext;
import com.sleepycat.dbxml.XmlResults;
import com.sleepycat.dbxml.XmlValue;
import com.sleepycat.db.DatabaseException;
import com.sleepycat.db.Environment;
import com.sleepycat.db.EnvironmentConfig;
import java.io.File;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.io.FileNotFoundException;
import javax.swing.JOptionPane;
public class VisualizzaDocumento {
public String doc="tiny4_LTQ-FT.mzML0.99.1.xml";
private static File path2DbEnv = new File("C:/mynbprogect1/search mzML2");
private static String theContainer = "container1.dbxml";
public static String id="";
/** Creates a new instance of VisualizzaDocumento */
public VisualizzaDocumento() {
// metodo per visualizzare l'id del documento
public static void asPresentazione()throws Throwable{
myDbEnv env = null;
     XmlContainer openedContainer = null;
     try {
XmlDocumentConfig conf= new XmlDocumentConfig();
conf.setWellFormedOnly(true);
     //Create an environment
     env = new myDbEnv(path2DbEnv);
     XmlManager theMgr = env.getManager();
     //Open a container in that environment
     openedContainer = theMgr.openContainer(theContainer);
     XmlQueryContext context = theMgr.createQueryContext();
String query="doc ('dbxml:/container1.dbxml/tiny5_LTQ-FT.mzML0.99.1.xml')/*/*/*/@ fullName";
XmlQueryExpression qe = theMgr.prepare(query, context);
XmlResults results = qe.execute(context);
if(results.size()==0){
// JOptionPane.showMessageDialog(null,"la query non ha prodotto risultati \n Riprova!!");
System.out.print("il resultset è vuoto");
XmlValue value = results.next();
qe.delete();
while (value != null) {
id = value.asString();
System.out.println("il valore del resulset è: "+id);
value.delete();
value = results.next();
results.delete();
     } catch (Exception e) {
System.err.println("Error performing query against " + theContainer);
System.err.println(" Message: " + e.getMessage());
throw e;
     finally {
     cleanup(env, openedContainer);
System.out.println("il metodo sembra che sia andato a buon fine");
}// end method
private static void cleanup(myDbEnv env, XmlContainer openedContainer) {
     try {
     if (openedContainer != null)
          openedContainer.close();
     if (env != null)
          env.cleanup();
     } catch (Exception e) {
System.out.println("l'errore in chiusura è il seguente" +e.getMessage());
THANK YOU SO MUCH.!
Francesco Galati

Answer 1

hi! I made what you wrote me and now the programm recognizes the elements but it doesen't recognize the attributes. what do I have to do for this situation?
for example:
-if I write doc ('dbxml:/container1.dbxml/tiny4_LTQ-FT.mzML0.99.1.xml')/mzML/cvList/cv/ @ * ---------it returns the exact result!
-if i write doc ('dbxml:/container1.dbxml/tiny4_LTQ-FT.mzML0.99.1.xml')/mzML/cvList/cv/ @ fullName ------------------- it doesn't indicate errors but the resultset remains empty
I wait for your answer and I send best reguards to you!
ciao ciao :)
Francesco Galati