With the 'damagevalues' attribute you can set how many damage values the block uses.
Valid values are integer between 1 and 15 (including both).
Default value: '0'
To set attributes for damagevalues you put the damage value after the attribute. For example 'name1=xyz' or 'name15=xyz'.
Attributes which can be used for damage values:
'name', 'textureindex', 'textureindextop', 'textureindexeast', 'textureindexwest', 'textureindexnorth', 'textureindexsouth', 'iddropped', 'damagedropped', 'quantitydropped', 'doubleslabid', 'doubleslabdamage', 'light', 'hardness', 'destroyed', 'neightborchanged', 'added', 'clicked', 'rightclicked', 'activated', 'deactivated'.
damagevalues=1
damagevalues=15