Duplication in LLM Input/Output Fields: Expected Behavior?

I noticed in https://github.com/Arize-ai/openinference/blob/main/spec/semantic_conventions.md there are both input.value and llm.input_messages , looking at a real example shows the input messages are duplicated in these two fields, is that expected? Similar observations for output.value and llm.output_messages is also noticed.