Opening bid of 2 diamonds shows:

5-5 major-minor with 6-10 HPC for example:

AQJxx x Q10xxx xx

OR

Jx Kxxxx x KJ9xx

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N S

2D 2H/S = weak 2-3 cards

3C/D = to play with 2-3 cards

3H = Weak, major's fits

N S

2D 2NT

3C = 5 clubs

3D = 5 diamonds 5 hearts

3H = 5 hearts 5 spades

3S = 5 spades 5 diamonds

N S

2D 2NT

3C 3D(relay)

3H = 5 hearts 5 clubs

3S = 5 spades 5 clubs for more