| Package | Description | 
|---|---|
| org.eclipse.rdf4j.rio | Rio: The rdf4j parser/writer API. | 
| org.eclipse.rdf4j.rio.helpers | Provides helpers classes for Rio. | 
| org.eclipse.rdf4j.rio.languages | Various  LanguageHandlerimplementations for processing language-tags. | 
| Modifier and Type | Method and Description | 
|---|---|
| protected String | LanguageHandlerRegistry. getKey(LanguageHandler handler) | 
| Modifier and Type | Field and Description | 
|---|---|
| static RioSetting<List<LanguageHandler>> | BasicParserSettings. LANGUAGE_HANDLERSSetting used to specify which  LanguageHandlerimplementations are to be used for a given parser
 configuration. | 
| Modifier and Type | Class and Description | 
|---|---|
| class  | BCP47LanguageHandlerA language handler that can verify BCP47 formatted language tags. | 
| class  | RFC3066LanguageHandlerA language handler that can verify RFC3066 formatted language tags. | 
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