package com.ojn.gexf4j.core; import java.util.Date; import java.util.List; public interface Metadata { boolean isEmpty(); Metadata clearMetadata(); boolean hasLastModified(); Metadata clearLastModified(); Date getLastModified(); Metadata setLastModified(Date lastModified); boolean hasCreator(); Metadata clearCreator(); String getCreator(); Metadata setCreator(String creator); boolean hasDescription(); Metadata clearDescription(); String getDescription(); Metadata setDescription(String description); List<String> getKeywords(); }