Cross-ontology multi-master replication

1. A method comprising:

storing a database change comprising a property value, the property value having an exporting site property type as defined in an exporting site ontology for an exporting site;

mapping the exporting site property type to an importing site property type defined by an importing site ontology for an importing site based on an ontology map comprising a one-to-one mapping between data types defined by the exporting site ontology and data types defined by the importing site ontology;

transforming the property value to an intermediate property value based on the importing site property type to simulate incorporating the property value into the importing site;

transforming the intermediate property value to a first round-trip value based on the exporting site property type to simulate incorporating the intermediate property value into the exporting site;

determining that the property value and the first round-trip value are different;

transforming the first round-trip value to a second intermediate value based on the importing site property type;

transforming the second intermediate value to a second round-trip value based on the exporting site property type;

determining whether to export the database change to the importing site based at least in part on a comparison between the first round-trip value and the second round-trip value;

exporting the database change to the importing site when the first round-trip value and the second round-trip value match,

wherein the method is performed by one or more computing devices.

2. The method of claim 1 , further comprising determining to export the database change to the importing site in response to determining that the property value and the first round-trip value are the same.

3. The method of claim 1 , further comprising flagging an incompatible mapping of the ontology map when the first-round trip value and the second-round trip value differ.

4. The method of claim 1 ,

wherein exporting the database change at the importing site comprises exporting based at least in part on the one-to-one mapping.

5. The method of claim 1 , further comprising flagging an incompatible mapping when the property value and the first round-trip value differ.

6. One or more non-transitory computer readable storage media storing instructions which, when executed, cause performance of:

storing a database change comprising a property value, the property value having an exporting site property type as defined in an exporting site ontology for an exporting site;

mapping the exporting site property type to an importing site property type defined by an importing site ontology for an importing site based on an ontology map comprising a one-to-one mapping between data types defined by the exporting site ontology and data types defined by the importing site ontology;

transforming the property value to an intermediate property value based on the importing site property type to simulate incorporating the property value into the importing site;

transforming the intermediate property value to a first round-trip value based on the exporting site property type to simulate incorporating the intermediate property value into the exporting site;

determining that the property value and the first round-trip value are different;

transforming the first round-trip value to a second intermediate value based on the importing site property type;

transforming the second intermediate value to a second round-trip value based on the exporting site property type;

determining whether to export the database change to the importing site based at least in part on a comparison between the first round-trip value and the second round-trip value;

exporting the database change to the importing site when the first round-trip value and the second round-trip value match.

7. The one or more non-transitory computer readable storage media of claim 6 , wherein the instructions, when executed, cause determining to export the database change to the importing site in response to determining that the property value and the first round-trip value are the same.

8. The one or more non-transitory computer readable storage media of claim 6 , wherein the instructions, when executed, cause flagging an incompatible mapping of the ontology map when the first-round trip value and the second-round trip value differ.

9. The one or more non-transitory computer readable storage media of claim 6 ,

wherein exporting the database change at the importing site comprises exporting based at least in part on the one-to-one mapping.

10. The one or more non-transitory computer readable storage media of claim 6 , wherein the instructions, when executed, cause flagging an incompatible mapping when the property value and the first round-trip value differ.

11. A system comprising:

one or more processors;

one or more non-transitory computer readable storage media coupled to the one or more processors and comprising logic configured to:

store a database change comprising a property value, the property value having an exporting site property type as defined in an exporting site ontology for an exporting site;

map the exporting site property type to an importing site property type defined by an importing site ontology for an importing site based on an ontology map comprising a one-to-one mapping between data types defined by the exporting site ontology and data types defined by the importing site ontology;

transform the property value to an intermediate property value based on the importing site property type to simulate incorporating the property value into the importing site;

transform the intermediate property value to a first round-trip value based on the exporting site property type to simulate incorporating the intermediate property value into the exporting site;

determining that the property value and the first round-trip value are different;

transforming the first round-trip value to a second intermediate value based on the importing site property type;

transforming the second intermediate value to a second round-trip value based on the exporting site property type;

determining whether to export the database change to the importing site based at least in part on a comparison between the first round-trip value and the second round-trip value;

exporting the database change to the importing site when the first round-trip value and the second round-trip value match.

12. The system of claim 11 , wherein the logic is configured to determine to export the database change to the importing site in response to determining that the property value and the first round-trip value are the same.

13. The system of claim 11 , wherein the logic is configured to flag an incompatible mapping of the ontology map when the first-round trip value and the second-round trip value differ.

14. The system of claim 11 , wherein the logic is configured to flag an incompatible type mapping when the property value and the first round-trip value are different.

15. The system of claim 11 , wherein exporting the database change at the importing site comprises exporting based at least in part on the one-to-one mapping.