import javax.xml.bind.*;
import javax.xml.bind.annotation.*;
import javax.xml.bind.annotation.adapters.*;
import java.io.*;
import java.util.*;

@XmlRootElement(name="myroot")
@XmlAccessorType(XmlAccessType.NONE)
class SO19509130d {

    private String id;
    private Properties props = new Properties();

    @XmlAttribute public String getId() { return id; }
    public void setId(String id) { this.id = id; }

    @XmlElement(name="property")
    public Collection<XmlProperty> getProperties() {
        return new XmlProperties(props);
    }

    @XmlType(name="property") static class XmlProperty {
        @XmlAttribute public String key;
        @XmlValue public String value;
    }

    static class XmlProperties extends AbstractCollection<XmlProperty> {
        private final Properties props;
        public XmlProperties(Properties props) { this.props = props; }
        public int size() { return props.size(); }
        public Iterator<XmlProperty> iterator() {
            return new XmlPropertyIterator(props.entrySet().iterator());
        }
        public boolean add(XmlProperty xml) {
            return !xml.value.equals(props.setProperty(xml.key, xml.value));
        }
    }

    static class XmlPropertyIterator implements Iterator<XmlProperty> {
        private final Iterator<Map.Entry<Object, Object>> base;
        public XmlPropertyIterator(Iterator<Map.Entry<Object, Object>> base) {
            this.base = base;
        }
        public boolean hasNext() { return base.hasNext(); }
        public void remove() { base.remove(); }
        public XmlProperty next() {
            Map.Entry<?, ?> entry = base.next();
            XmlProperty xml = new XmlProperty();
            xml.key = entry.getKey().toString();
            xml.value = entry.getValue().toString();
            return xml;
        }
    }

    public static void main(String[] args) throws Exception {
        SO19509130d obj = new SO19509130d();
        obj.id = "theID";
        obj.props.setProperty("key1", "val1");
        obj.props.setProperty("key2", "val2");
        JAXBContext ctx = JAXBContext.newInstance(SO19509130d.class);
        Marshaller m = ctx.createMarshaller();
        Unmarshaller u = ctx.createUnmarshaller();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        m.marshal(obj, baos);
        InputStream bais = new ByteArrayInputStream(baos.toByteArray());
        obj = (SO19509130d)u.unmarshal(bais);
        m.marshal(obj, System.out);
        System.out.println();
    }
}

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