private static void exportImportedFields(Set<String> importedFieldNames, Writer out, int ind) throws IOException {
        out.write(ind(ind) + "java.util.Set<java.lang.String> importedFieldNames = new java.util.HashSet<>();\n");
        for (String importedField : importedFieldNames) {
            out.write(ind(ind) + "importedFieldNames.add(\"" + importedField + "\");\n");
        }
    }
\n"+
                ind(ind)+" * Constructs a "+className+" by taking a deep copy of the provided StructuredFieldValue.\n" +
                ind(ind)+"
vespa-documentgen-plugin/src/main/java/com/yahoo/vespa/DocumentGenMojo.java