Bug 124067 When select the XML file, the relative path should be supported.
Description: When select the XML file, the relative path should be supported. Step to reproduce: 1. new a report 2. new a datasource and dataset based on a XML file 3. select the XML file, the file relative path should be used. Actual result: only the absolute path is supported. Expect result: the relative and absolute path are supported.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/adapter/ModelDteApiAdapter.java
Iterator elmtIter = modelDataSet.parametersIterator( );
		if ( elmtIter != null )
		{
			while ( elmtIter.hasNext( ) )
			{
				DataSetParameterHandle modelParam = ( DataSetParameterHandle ) elmtIter
						.next( );
				dteDataSet.addParameter( newParam( modelParam ) );
				
				
				
				if ( modelParam.isInput( ) )
				{
					String defaultValueExpr = modelParam.getDefaultValue( );
					if ( defaultValueExpr != null )
						paramBindingCandidates.put( modelParam.getName( ),
								defaultValueExpr );
				}
			}
		}
		
		elmtIter = modelDataSet.paramBindingsIterator( );
		if ( elmtIter != null )
		{
			while ( elmtIter.hasNext( ) )
			{
				ParamBindingHandle modelParamBinding = ( ParamBindingHandle ) elmtIter
						.next( );
				
				paramBindingCandidates.put( modelParamBinding.getParamName( ),