(oops, send button pressed itself prematurely)
anyway, this doesn't work:
<TextNode>Some text</TextNode>
but this does:
<TextNode text="Some text"/>
So a working example of what I wanted might be
<Paragraph>
<Span font="{bold:true}">
<TextNode text="Label:"/>
</Span>
<TextNode text=" something of interest "/>
<Span font="{italic:true}">
<TextNode text="(some remark)"/>
</Span>
</Paragraph>
It would be very nice if whatever magic on Paragraph allows
<Paragraph>This is a plain text paragraph</Paragraph>
would allow my example to be expressed as
<Paragraph>
<Span font="{bold:true}">Label:</Span>
<Span> something of interest </Span>
<Span font="{italic:true}">(some remark)</Span>
</Paragraph>