Sentence:  From the point of view of syntactic analysis the head word in the statement is the predicator has broken , and from the point of view of meaning it would seem that the trouble centers in the breaking ; but dominant <WSD>stress</WSD> will be assigned to broken only in rather exceptional versions of the sentence . 
Meaning of the word marked with <WSD> tags:  the relative prominence of a syllable or musical note (especially with regard to stress or pitch)