source_field,target_field,rule,notes
builder.id,builder.id,copy,""
builder.version,builder.version,copy,""
invocation.configSource.uri,configSource.uri,copy,""
invocation.configSource.digest,configSource.digest,copy,""
materials[],materials[],copy,"Keep materials but drop integrity fields unsupported in 1.0"
subject[],subject[],copy,""
provenance.dsse,metadata.buildInvocationID,copy,"Use DSSE hash as buildInvocationID placeholder"
metadata.startedOn,metadata.buildStartedOn,copy,""
metadata.finishedOn,metadata.buildFinishedOn,copy,""