Predicated Theme: Encoding Identifying Clause

It	is	John	that	I	love
Theme	Rheme		Theme	Rheme
Theme			Rheme
		New	Given
Sub-	Finite	Complement	-ject
Val-	Process	Token/Identifier	-ue/Identified
Head/Thing			Postmodifier/Qualifier

For the textual and interpersonal analyses, see Halliday & Matthiessen (2004: 97, 157).

For the experiential analysis, the reasoning is as follows:

• for Token-Value structure, compare the agnate clause: John represents the one that I love where John functions as (the less abstract) Token (see Halliday & Matthiessen 2004: 231);
• for Identifier-Identified structure, consider the probe: Which represents the one that I love?; that is, the one that I love is identified by John, so John functions as the Identifier (see Halliday & Matthiessen 2004: 228).  Also, in the unmarked case, the Identifier conflates with the New information, as it does here (Halliday & Matthiessen 2004: 229).

The conflation of Token/Identifier and Value/Identified occurs in encoding identifying clauses.  In such clauses, the identity encodes the Value by reference to the Token, so in this clause, the identity encodes it…that I love by reference to John (see Halliday & Matthiessen (2004: 230).

Complement Realised As Prepositional Phrase

the only time the ceremony has been interrupted in the last 700 years	was	during the Second World War
Value/Location	Process	Token/Location
Subject	Finite	Complement

Reasoning:

If 'a Complement is an element within the Residue that has the potential of being Subject but is not' (Halliday & Matthiessen 2004: 122), and 'an Adjunct is an element that has not got the potential of being Subject' (op cit: 123), then the 'circumstance as participant' during the Second World War functions as Complement, not Adjunct, despite the fact that a Complement 'is typically realised by a nominal group' (ibid), since it has the potential of being Subject, as the following agnate clause demonstrates:

during the Second World War was the only time the ceremony has been interrupted in the last 700 years (wasn't it?)

during the Second World War	was	the only time the ceremony has been interrupted in the last 700 years
Token/Location	Process	Value/Location
Subject	Finite	Complement

See also Fig. 5-26 (op cit: 244).