| Mtext (attr,s) -> X.xml_nempty ~prefix "mtext" attr (X.xml_cdata s)
| Mspace attr -> X.xml_empty ~prefix "mspace" attr
| Ms (attr,s) -> X.xml_nempty ~prefix "ms" attr (X.xml_cdata s)
| Mtext (attr,s) -> X.xml_nempty ~prefix "mtext" attr (X.xml_cdata s)
| Mspace attr -> X.xml_empty ~prefix "mspace" attr
| Ms (attr,s) -> X.xml_nempty ~prefix "ms" attr (X.xml_cdata s)