To implement buidling blocks, i.e. subexpression protected from variation,
expression nodes may be tagged with buildingBlockTags. TODO
| 1 2 3 4 5 | buildingBlockTag(x)
buildingBlockTag(x) <- value
hasBuildingBlockTag(x)
 | 
| x | An expression node. | 
| value | The value of the building block tag. Must be a numerical in the interval [0.0 1.0]. | 
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