public Builder type(final String value) {
            this.type = value;
            return this;
        }
@param value The type of the 'document' that this docRef points to an instance of. Supported types are defined
             outside of this documentation.
@return The {@link Builder}, enabling method chaining
stroom-legacy/stroom-legacy-model_6_1/src/main/java/stroom/legacy/model_6_1/DocRef.java