Bug 153853 [Regression]The bound column names must be unique within the entire table.
Regression case Regression_136421(under org.eclipse.birt.report.tests.model) failed. Expected result: Model will avoid adding a duplicate bound column name within a table.
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/api/ModuleHandle.java
* support UnicodeUtil.SIGNATURE_UTF_8.
	 * 
	 * @return the encoding of the file
	 */
	public String getFileEncoding( )
	{
		return UnicodeUtil.SIGNATURE_UTF_8;
	}
	/**
	 * Gets symbolic name of this module if defined. This property is needed
	 * when search resources in fragments. Usually it should be the plug-in id
	 * of the host plug-in.
	 * 
	 * @return
	 */
	public String getSymbolicName( )
	{
		return this.getStringProperty( SYMBOLIC_NAME_PROP );
	}
	/**
	 * Sets symbolic name of this module. This property is needed when search
	 * resources in fragments. Usually it should be the plug-in id of the host
	 * plug-in.
	 * 
	 * @param symbolicName
	 * @throws SemanticException
	 */
	public void setSymbolicName( String symbolicName ) throws SemanticException
	{
		setStringProperty( SYMBOLIC_NAME_PROP, symbolicName );