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17	17	Tags provide meaning to the objects. Without them, any other object would be useless and meaningless. Each of ''three other data primitives'' '''can have multiple tags'''.
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19		Often tags used in combinations; usually these combinations can be found in [Presets presets]. But it may be true that tags you need to use are not in presets and you need to know them first.
	19	Often tags used in combinations; '''usually these combinations can be found in [wiki:Presets presets]'''. But it may be true that tags you need to use are not in presets and you need to know them first.
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21	21	Simplest example is [osmwiki:Key:drinking_water drinking_water=yes] - it is present globally and can be applied to every object that provides water. Other example is [osmwiki:Key:leaf_cycle leaf_cycle=*] of trees, it will have less coverage globally (as trees do not grow just everywhere).