| Name | Description | Type | Package | Framework |
| IsotopeHandler | Reads an isotope list in CML2 format. | Class | org.openscience.cdk.config.isotopes | CDK |
| IsotopeReader | Reader that instantiates an XML parser and customized handler to process the isotope information in the CML2 isotope data file. | Class | org.openscience.cdk.config.isotopes | CDK |