How to nest Avalon List items in a document?

List objects are containers for ListItem objects. ListItem objects, in turn, contain blocks, such as paragraphs or lists. So, to nest multiple lists, you can do something like this.

<TextFlow
xmlns='https://schemas.microsoft.com/winfx/avalon/2005'
FontSize='16pt'>
<Paragraph>Top-level text.</Paragraph>
<List>
<ListItem>
<Paragraph>Level 1</Paragraph>
<List>
<ListItem>
<Paragraph>Level 2</Paragraph>
<List>
<ListItem>
<Paragraph>Level 3</Paragraph>
<Paragraph>...</Paragraph>
</ListItem>
</List>
</ListItem>
</List>
</ListItem>
</List>
</TextFlow>

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