Include suggestion about feature identifiers #121
Merged
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Based on discussion in #120, this adds documentation that suggests adding custom file key/value metadata for things like feature identifiers.
I didn't use language like "primary key" as suggested in previous discussion. I think these feature identifiers typically represent "external" identifiers instead of something like a primary key in a database.
If others think that the extra language risks misinterpretation or is not useful, I'm not attached to having it in.
Fixes #120.