The text MUST NOT be null
nor an empty {@link String}. The language may be null
(indicating the default language) or any kind of value. It is recommended to use ISO 639-1 codes (two Letter codes). By definition it is also allowed to use empty strings as language. However implementations of this interface are free to convert the empty language to null
.
Implementations of that interface MUST BE immutable @author Rupert Westenthaler
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