textBox becomes an inline node carrying block content, like the frame both
formats write, so "in line with text" really is in the line and a box reaches
a table cell or a list item through their paragraphs. Both exports write it
where it sits (an as-char draw:frame / a wp:inline drawing) and both imports
leave it there, which drops the hoisting machinery on either side.
Two guards the schema cannot express: no box inside a box, and a selection
reaching into a box grows to the box's bounds rather than dissolving it.
tests/kitchenSink.ts authors one deterministic document using every
feature; schema-validation.test.ts validates its .odt against the ODF 1.3
RelaxNG and its .docx parts (after MCE resolution, as Word reads them)
against the ECMA-376 transitional XSDs — the structural half of Word's
strict reader, which LibreOffice silently forgives. Schemas vendored under
tests/schemas/ (sources and offline patches in its README); self-skips
without xmllint, which CI now installs.