Unknown element OMS must have just cd and name attributes OMS must be EMPTY Bad name: not in OMV must have just name attribute OMV must be EMPTY OMI does not take attributes OMI should only have character data OMF must only have dec or hex attribute OMF must be EMPTY OMA does not take attributes OMA must have at least one child element OME does not take attributes OME must have first child an OMS OMBIND does not take attributes OMBIND must have three children, with second child an OMBVAR OMBVAR does not take attributes OMBVAR may only contain attributed variables OMATP does not take attributes OMATP must have odd children OMS OMATTR must have exactly two children First child of OMATTR must be OMATP