mandatory (M)means a category of information that Member States are required to submit to the EU Building Stock Observatory;
mandatory if applicable (Miap)means a category of information that Member States are required to submit if it is required by Union or national legislation;
mandatory if available (Miav)means a category of information that Member States are required to submit only if such information is available to them at the time of submitting the information;
voluntary (V)means a category of information which Member States submit on a voluntary basis.