What does semi-dry mean?

In German-speaking countries,"halbtrocken" refers to a still wine that has more than 9 and less than 18 grams of residual sugar per litre. The upper limit of 18 grams per litre applies on condition that the residual sugar content is no more than 10 grams per litre above the total acidity content. If the residual sugar content is more than 10 grams per litre above the total acidity, the upper limit is 12 grams of residual sugar per litre for the wine to be described as "semi-dry".

For sparkling wine bearing the designation "semi-dry", the residual sugar content may be between 32 and 50 grams per litre.