"select distinct" in E4X

I know this is a long shot… but

  • is there anything like “select distinct” query in E4X.
    “select distinct” - comes from SQL lingo, returns unique (non repetitive) list of items

furthermore

  • is tehre something similar to SQL “TOP n” returning only first n items

as I said… long shot… but one never knows :O)
thanx for your time

Petr