Function write_document 

pub fn write_document(
    document: &Document,
    options: WriteOptions,
) -> OgeomResult<String>

Write a document: the model, then the product structure, appearance, names and PMI over it.

The model section is exactly what write() emits, so a model-only reader stops cleanly at the document records; writing what read_document read reproduces the bytes, the same contract the model layer keeps.

Errors

As write().