libyang  2.0.231
libyang is YANG data modelling language parser and toolkit written (and providing API) in C.
 All Data Structures Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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