appengine one-to-many relationship

//
The two classes represent [un-owned] one-to-many relationship between a theme and verses. Each theme can have several verses. The persistence is done using jdo appengine api which i've implemented.  like

//verse details
            Verse verse = new Verse();
            verse.setVerseTitle("i shall not fear");
            verse.setVerseRef("psalms 23:2");
            verse.setVerseBody("the lord is my light and salvation, whom shall i fear");

            //theme details
            Theme theme = new Theme();
            theme.setTheme("psallms");
            theme.setThemeDescription("this is the theme on book of psalms");

            theme.getVerseSets().add(verse);
            pm.makePersistent(theme);

My question is;
How do i select only verses from a specific theme...the equivalent of "select * from verse where theme_id="theme_id" if it were the usual relational db.

//Theme.java
package com.versefeed.entities;

import java.util.List;

import javax.jdo.annotations.Element;
import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Key;

@PersistenceCapable
public class Theme {


    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

    @Persistent
    private String theme;
    @Persistent
    private String themeDescription;
    @Persistent
    private String themeArthur;

    @Persistent(mappedBy = "themes")
    @Element(dependent = "true")//cascade deletes to child objects
    private List<Verse> verseSets;

    public String getTheme() {
        return theme;
    }

    public void setTheme(String theme) {
        this.theme = theme;
    }

    public String getThemeDescription() {
        return themeDescription;
    }

    public void setThemeDescription(String themeDescription) {
        this.themeDescription = themeDescription;
    }

    public String getThemeArthur() {
        return themeArthur;
    }

    public void setThemeArthur(String themeArthur) {
        this.themeArthur = themeArthur;
    }

    public List<Verse> getVerseSets() {
        return verseSets;
    }

    public void setVerseSets(List<Verse> verseSets) {
        this.verseSets = verseSets;
    }

    public Key getKey() {
        return key;
    }

    public Theme() {
        // TODO Auto-generated constructor stub
    }

}

//Verse.java
package com.versefeed.entities;

import javax.jdo.annotations.IdGeneratorStrategy;
import javax.jdo.annotations.PersistenceCapable;
import javax.jdo.annotations.Persistent;
import javax.jdo.annotations.PrimaryKey;

import com.google.appengine.api.datastore.Key;
import com.google.appengine.api.datastore.Text;

@PersistenceCapable
public class Verse {

    @PrimaryKey
    @Persistent(valueStrategy = IdGeneratorStrategy.IDENTITY)
    private Key key;

    @Persistent
    private boolean flag = false;
    @Persistent
    private Text verseBody;
    @Persistent
    private String verseRef;
    @Persistent
    private String verseTitle;

    @Persistent
    private Theme themes;


    public Verse() {
        // TODO Auto-generated constructor stub
    }


    public boolean isFlag() {
        return flag;
    }


    public void setFlag(boolean flag) {
        this.flag = flag;
    }


    public Text getVerseBody() {
        return verseBody;
    }


    public void setVerseBody(String verseBody) {

        this.verseBody = new Text(verseBody);
    }


    public String getVerseRef() {
        return verseRef;
    }


    public void setVerseRef(String verseRef) {
        this.verseRef = verseRef;
    }


    public String getVerseTitle() {
        return verseTitle;
    }


    public void setVerseTitle(String verseTitle) {
        this.verseTitle = verseTitle;
    }



}