Newer Version Available
Schema
You can download the schema file for an API version by using the following URI:
Web_Services_SOAP_endpoint_instance_name/services/async/APIversion/AsyncApi.xsd
For example, if you're working with version 44.0 of the Bulk API on your own instance, the URI is:
https://yourInstance.salesforce.com/services/async/44.0/AsyncApi.xsd
The instance name for your organization is returned in the LoginResult serverUrl field.
Schema and API Versions
The schema file is available for API versions prior to the current release. You can download the schema file for API version 18.0 and later. For example, if you want to download the schema file for API version 18.0, use the following URI:
https://yourInstance.salesforce.com/services/async/18.0/AsyncApi.xsd