Using XPath, how to select elements with a missing attribute

Question

I would like to select all elements that have a specific attribute or do not have it at all:

//job[@salary<"100" or !@salary ] 

This code is not valid. Which one of? Thanks!

Answer 1

 //job[@salary<"100" or not(@salary)] 

There is no operator in xpath. See http://www.w3schools.com/xpath/xpath_operators.asp

Answer 2

 //job[count(@salary) = 0] 

I think:)

Answer 3

 //job[@salary<"100" or count(@salary)=0] 

Tested here and works great.