[Typo3] Hierarchical section index?

[christian reiter]

Hello list,

I want to realise the following with the section index menu type.
My question is whether the situation below is doable with the standard menu
types and typoscript or whether it would be easier to make a menu type
extension for this.

The documents, with standard content elements, are structured in the
following way,

header(layout1) "This is Section 1" -> rendered as H1
header(layout2) "This is a Subsection" ->H2
header(layout2) "This is another Subsection of Section 1" ->H2
header(layout1) "Section 2 begins here" ->H1
header(layout2) "Subsection 2.1" ->H2
header(layout3) "Subsection 2.1.1" ->H3
header(layout2) "Subsection 2.2" ->H2
header(layout2) "Subsection 2.3" ->H2
header(layout3) "Subsection 2.3.1" ->H3
header(layout3) "Subsection 2.3.2" ->H3
header(layout1) "Section 3 begins here" ->H1

etc...
and the Section index should look like either a nested unordered list
reflecting the structure above,
or a sectioned TOC like

1. This is Section 1
1.1 ...
1.2 ...
2  ...
2.1 ...
2.1.1 ...
2.2 ...
2.3 ...
2.3.1 ...
2.3.2 ...
3 ...

Best regards,

Christian Reiter