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Oxygen XML Developer has an SDK that can be used as a base to develop frameworks and plugins. The SDK is a Java library available under the Oxygen XML SDK licensing terms and is delivered with a set of examples that demonstrate how to extend Oxygen XML functionality through API calls. The SDK is available at https://www.oxygenxml.com/oxygen_sdk.html.
Important: From a legal standpoint, you can freely develop and share extensions using the Oxygen SDK ONLY if you have a legal, active license to use Oxygen XML Developer and ONLY if such extensions are used from inside Oxygen XML Developer. To use such extensions outside of Oxygen XML Developer (for example, a 3rd-party application that has Oxygen XML Developer built in to it), an additional license must be purchased to use the SDK according the Oxygen XML SDK Licensing Policy .