Bug 138562 Splite extendsexcpetion to seperate sub class
The suggestion is Parent invalid Cycle extends Different type extends Not top level extends
model/org.eclipse.birt.report.model/src/org/eclipse/birt/report/model/core/DesignElement.java
* user-defined property.
	 * <p>
	 * Part of: Property system.
	 * 
	 * @param propName
	 *            The name of the property to validate.
	 * @throws PropertyNameException
	 *             If the property is undefined.
	 */
	void validatePropertyName( String propName ) throws PropertyNameException
	{
		if ( getPropertyDefn( propName ) == null )
			throw new PropertyNameException( this, propName );
	}
	/**
	 * Validates the given property value. Validation may map the value onto a
	 * new value that should be used for the actual property update.
	 * <p>
	 * Part of: Property system.
	 * 
	 * @param module
	 *            the module
	 * @param propName
	 *            The name of the property to validate.
	 * @param value
	 *            The value to validate
	 * @return The validated value.
	 * @throws PropertyNameException
	 *             If the property is undefined.
	 * @throws PropertyValueException