[NTG-context] verify if you are already postponing notes

Dear list, I'm typesetting XHTML and there is a couple of cases (tables and math), where I use \postponenotes ... \flushnotes in both their XML setups. The problem arises when I have math inside the cell of a table, so I get those commands nested: \postponenotes % <table> element \postponenotes % <span class="math"> element inside a cell \flushnotes % </span> closing math \flushnotes % </table> closing table With CSS selectors or XML machinery I can find those corner cases, but something like this would be better because more general: \doifnotpostponingnotes{\postponenotes} \dofipostponingnotes{\flushnotes} Is there a way to define those \doif... macros? Massi