BaseDescr input = accumDescr.getInput();
if( input instanceof AndDescr && ((AndDescr) input).getDescrs().size() == 1 ) {
input = ((AndDescr) input).getDescrs().get( 0 );
}
final RuleConditionBuilder builder = (RuleConditionBuilder) context.getDialect().getBuilder( input.getClass() );
final RuleConditionElement source = builder.build( context,
input );
if ( source == null ) {
return null;
}