https://blogs.mulesoft.com/dev-guides/api-connectors-templates/custom-connector-mule-sdk/

https://www.mulesoft.com/platform/cloud-connectors/certified

https://dzone.com/articles/how-to-create-a-custom-connector-in-new-mule-sdk-4

https://dzone.com/articles/mulesoft-custom-connector-using-mule-sdk-for-mule

https://dzone.com/articles/creating-a-custom-connector-using-xml-sdk-and-depl

https://docs.mulesoft.com/connectors/xml/xml-schema-validation