[NTG-context] how to change metadata halfway through document

[jbf]

Am trying to understand how best to change the title metadata in 
headertext halfway through a document that has two parts: Constitutions 
and Regulations.

My first attempt (did not work)

\startsetups[headertext]

\startdocument

[metadata:title={Regulations}]

\stopsetups

\setupheadertexts

[ ] [{\getmarking[chapter]\hskip1em \pagenumber}]

[{\pagenumber \hskip1em \setup{headertext}}] [ ]

My second attempt (quite crass, but it works!!) was to create a second 
\startdocument within the main \startdocument (obviously closing it 
towards the end but before the main \stopdocument), this time with 
[metadata:title={Regulations}] instead of the original 
[metadata:title={Constitutions}]. However, I have a strong feeling this 
is not a very elegant solution!

Thoughts?

Julian
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