Question about the mzTab output format

[mpage21]

Hello, I am new to proteomics and am trying to understand the mzTab output file. Specifically, I am looking for information about the opt_ columns and how to interpret the values in them. For example, in the protein table, there is a column opt_global_result_type. The majority of the values in that column are either protein_details or single_protein, but I don't understand what the difference is. Could you explain or could point me to documentation that explains those opt_ columns specific to this pipeline's output?