[boost] proto::tag naming convention

What is the rationale for not having proto::tags match the corresponding mpl metafunctions? For instance mpl has plus and proto has add (but unary_plus). Since people will often mix the two, it would be nice to have the same name. (I basically have to look them up everytime I use one of them) If the intention was to make them different so that they can be mixed without namespace qualification I think they're not different enough. Given divide and divides, which is proto's and which is mpl's? Clearly one gets used to these things, but maybe it is something to consider before finalizing proto for inclusion in boost. regards Maurizio