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YANG Features

YANG feature statement is an important part of the language which can significantly affect the meaning of the schemas. Modifying features may have similar effects as loading/removing schema from the context so it is limited to context preparation period before working with data. YANG features, respectively their use in if-feature statements, are evaluated as part of schema compilation so a feature-specific compiled schema tree is generated as a result.

To enable any features, they must currently be specified when implementing a new schema with lys_parse() or ly_ctx_load_module(). To later examine what the status of a feature is, check its LYS_FENABLED flag or search for it first with lys_feature_value(). Lastly, to evaluate compiled if-features, use lysc_iffeature_value().

To iterate over all features of a particular YANG module, use lysp_feature_next().

Note, that the feature's state can affect some of the output formats (e.g. Tree format).

## Functions List

- lys_feature_value()
- lysc_iffeature_value()
- lysp_feature_next()