Dúvida no composite do Hibernate

public class ExiCargo implements java.io.Serializable {

	/**
	 * 
	 */
	private static final long serialVersionUID = 3835538178445863581L;

	// Fields    

	private Integer pkExiCargo;

	private Date timestamp;

	private Integer fkElemento;

	private Integer fkCargo;
	
	private Cargo cargo;
	
	private Elemento elemento;
	
	// Constructors

	public Cargo getCargo() {
		return cargo;
	}

	public void setCargo(Cargo cargo) {
		this.cargo = cargo;
	}

	public Elemento getElemento() {
		return elemento;
	}

	public void setElemento(Elemento elemento) {
		this.elemento = elemento;
	}

	/** default constructor */
	public ExiCargo() {
	}

	/** full constructor */
	public ExiCargo(Integer fkElemento, Integer fkCargo) {
		this.fkElemento = fkElemento;
		this.fkCargo = fkCargo;
	}

	// Property accessors
	public Integer getPkExiCargo() {
		return this.pkExiCargo;
	}

	public void setPkExiCargo(Integer pkExiCargo) {
		this.pkExiCargo = pkExiCargo;
	}

	public Date getTimestamp() {
		return this.timestamp;
	}

	public void setTimestamp(Date timestamp) {
		this.timestamp = timestamp;
	}

	public Integer getFkElemento() {
		return this.fkElemento;
	}

	public void setFkElemento(Integer fkElemento) {
		this.fkElemento = fkElemento;
	}

	public Integer getFkCargo() {
		return this.fkCargo;
	}

	public void setFkCargo(Integer fkCargo) {
		this.fkCargo = fkCargo;
	}
}

a?xml version="1.0a
a!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"a
a!-- Generated 07/08/2006 08:48:12 by Hibernate Tools 3.1.0.beta5 --a
ahibernate-mappinga
    aclass name="br.com.shc.teste.relacionado.ExiCargo" table="exicargo"a
                aid name="pkExiCargo" type="java.lang.Integer"a
            acolumn name="PkExiCargo" /a
            agenerator class="native"a/generatora
        a/ida
        atimestamp name="timestamp" column="Timestamp" /a
        
        amany-to-one name="cargo" class="br.com.shc.database.cargo.Cargo" fetch="join"a
        	acolumn name="FkCargo" not-null="true"a
        		
        	a/columna
		a/many-to-onea
        
		amany-to-one name="elemento" class="br.com.shc.database.elemento.Elemento" fetch="join"a
        	acolumn name="FkElemento" not-null="true"a
        		        	a/columna
        a/many-to-onea 
    a/classa
a/hibernate-mappinga

Hibernate: 
    select
        exicargo0_.PkExiCargo as PkExiCargo1_2_,
        exicargo0_.Timestamp as Timestamp1_2_,
        exicargo0_.FkCargo as FkCargo1_2_,
        exicargo0_.FkElemento as FkElemento1_2_,
        cargo1_.PkCargo as PkCargo0_0_,
        cargo1_.Timestamp as Timestamp0_0_,
        cargo1_.Descricao as Descricao0_0_,
        elemento2_.PkElemento as PkElemento2_1_,
        elemento2_.Timestamp as Timestamp2_1_,
        elemento2_.FkSubord as FkSubord2_1_,
        elemento2_.Nome as Nome2_1_,
        elemento2_.Codigo as Codigo2_1_,
        elemento2_.Sigla as Sigla2_1_,
        elemento2_.CNPJ as CNPJ2_1_,
        elemento2_.IE as IE2_1_ 
    from
        exicargo exicargo0_ 
    inner join
        cargo cargo1_ 
            on exicargo0_.FkCargo=cargo1_.PkCargo 
    inner join
        elemento elemento2_ 
            on exicargo0_.FkElemento=elemento2_.PkElemento 
    where
        exicargo0_.PkExiCargo=?