Performance

I just have noticed 

This way of writing the code is much faster

count(*[starts-with(name(),'DGBUIMSNNumber')][(_at_)action='add'])

than this way:

count(*[starts-with(name(),'DGBUIMSNNumber') and @action='add'])


Why is that?


And how do I write this piece of code like the above in the 'faster'
way?

count(*[starts-with(name(),'DGBUIMSNNumber') and (@action='default' or
@action='add')])


Because this would imply I had two 'and' instead of one 'and' and one
'or' correct?

count(*[starts-with(name(),'DGBUIMSNNumber')][(_at_)action='default'][(_at_)action
='add'])


Regards
Houman

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