Nanoc’s terminology is inconsistent with the industry

Filter

In the real world, a filter is a device that separates one substance from another. See also Enumerable#filter, an alias for #select.

In Nanoc, a filter transforms data, e.g. from Markdown to HTML.

A better name in Nanoc would be transform.

Identifier vs. path

Identifiers are technically paths as of Nanoc 4 (at least when not using the legacy identifiers), but the distinction is not clear.

A better name for an identifier could be:

• input path vs. output path
• raw path vs. compiled path
• raw path vs. cooked path
• raw path vs. baked path