Domain consistency is being consistent with a specific domain.
For example, if you're developing a scientific publications directory, you should conduct some research in order to acquire knowledge and norms that are specific to this domain. For example, you should know that a scientific publication may be identified with a PubMed Identifier (PMID), PMCID, Manuscript ID, or Digital Object Identifier (DOI), so your API's response object should include fields that contain these different identifiers, or at least allow users to search for articles based on these IDs. This is consistent with the norms of the scientific domain.
Another example is to allow for filters that are consistent with the domain. Continuing with the scientific ...
