D-Net

import com.google.common.collect.Lists;

import com.google.common.collect.Sets;

import eu.dnetlib.data.proto.FieldTypeProtos.*;

import org.apache.hadoop.hbase.io.ImmutableBytesWritable;

import com.google.common.base.Function;

		if (t instanceof StructuredProperty) return ((StructuredProperty) t).getValue();

		if (t instanceof KeyValue) return ((KeyValue) t).getValue();

		if (t instanceof String) return (String) t;

		if (t instanceof StringField) return ((StringField) t).getValue();

		if (t instanceof Qualifier) return ((Qualifier) t).getClassname();

		if (t instanceof Author) return ((Author) t).getFullname();