openEHR is an open standard that uses a novel two-level modelling methodology to represent health information and meta-data by preserving the semantics during when it were created. It enables semantic interoperability and makes it possible to link disparate data sources easily and safely. It also allows for terminology binding which provides the bridge between the 'terminology' and 'information model' this making it much more useful than using these standards separately. Although openEHR is a de-facto standard that is developed by volunteers openly, ISO and CEN adopted it (ISO/EN 13606) so it is a full international standard. It has relationship and mappings between other standards, such as HL7.