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Here are the steps to apply a Java digital signature to an XML DSIG DTO:

1. Create a key pair – You need to create a public and private key pair using the Java Keytool. This key pair will be used for the digital signature.

2. Create a XML document – You need to create the XML document that you want to sign. You can use any XML editor to create the document.

3. Create a signature – You need to create the digital signature using the private key from step 1. You can use the Java Security API to create the signature. You will need to pass in the XML document and the private key.

4. Add the signature to the XML document – You need to add the digital signature to the XML document. You can use the XML Digital Signature API to do this.

5. Verify the signature – You need to verify the digital signature to make sure it is valid. You can use the public key from step 1 to verify the signature. You can also use the XML Digital Signature API to do this.

6. Save the XML document – You need to save the XML document with the digital signature added to it. The document can now be used for secure communication or storage.

Note: The process for applying a Java digital signature to an XML DSIG DTO may vary depending on the specific implementation and tools used.