Embedded Vs Dependent Relative Clauses

(1) John wants to marry a woman who is a millionaire

(2) John wants to marry a woman, who is a millionaire

John	wants to marry	a woman [[who is a millionaire]]
Actor	Process: material	Goal

John	wants to marry	a woman		who	(incidentally) is	a millionaire
a			=	b
Actor	Process: material	Goal		Carrier	Process: attributive	Attribute

Viewed from above, in terms of the meaning being realised by the wording, the embedded relative clause in (1) is defining, whereas the dependent relative clause in (2) is non-defining.

Viewed from below, in terms of the sounding that realises the wording, in unmarked cases, the embedded (defining) relative clause serving as Qualifier in (1) is included in the same tone group as the Thing (woman) it qualifies, thus construing it as the same piece of information, whereas the dependent (non-defining) relative clause in (2) is assigned to a separate tone group, thereby construing it as a distinct unit of information.