package de.uni_koeln.spinfo.drc.mongodb;

public interface Constans {
	
	public static final String CHAPTERS = "chapters";
	public static final String LANGUAGES = "languages";
	public static final String PAGES = "pages";
	public static final String VOLUMES = "volumes";
	public static final String WORDS = "words";
	public static final String PAGE = "page";

}

package de.uni_koeln.spinfo.drc.mongodb;

public interface Constants {
	
	public static final String CHAPTERS = "chapters";
	public static final String LANGUAGES = "languages";
	public static final String PAGES = "pages";
	public static final String VOLUMES = "volumes";
	public static final String WORDS = "words";
	public static final String PAGE = "page";

}

Fix typo.