Interface that is loosely similar to jakarta.xml.bind.annotation.XmlValue in that it can be used on one (and only one!) property of a POJO. It will result in value of the property be serialized without element wrapper, as long as there are no element-wrapped other properties (attribute-valued properties are acceptable). It is also somewhat similar to core Jackson @JsonValue annotation; but has to be separate as @JsonValue does not allow any other properties.

Note that only one such property is allowed on a POJO: if multiple properties are annotated, behavior is not defined.

Internally properties annotated will be considered to be properties with no name (that is, with marker "" (empty String)).