src/main/java/me/neznamy/tab/api/TABAPI.java
public static void registerRelationalPlaceholder(RelationalPlaceholder placeholder) {
		APIPlaceholders.put(placeholder.getIdentifier(), placeholder);
		PlaceholderManager pl = TAB.getInstance().getPlaceholderManager();
		pl.registerPlaceholder(placeholder);
		pl.allUsedPlaceholderIdentifiers.add(placeholder.getIdentifier());
	}
/**
	 * Registers a relational placeholder
	 * @param placeholder - Placeholder handler
	 * @since 2.8.0
	 */
Registers a relational placeholder
@param placeholder - Placeholder handler
@since 2.8.0
Registers a relational placeholder @param placeholder - Placeholder handler @since 2 . 8 . 0
public static void registerRelationalPlaceholder(RelationalPlaceholder placeholder) {
		APIPlaceholders.put(placeholder.getIdentifier(), placeholder);
		PlaceholderManager pl = TAB.getInstance().getPlaceholderManager();
		pl.registerPlaceholder(placeholder);
		pl.allUsedPlaceholderIdentifiers.add(placeholder.getIdentifier());
	}
public static void registerRelationalPlaceholder ( RelationalPlaceholder placeholder ) { APIPlaceholders . put ( placeholder . getIdentifier ( ) , placeholder ) ; PlaceholderManager pl = TAB . getInstance ( ) . getPlaceholderManager ( ) ; pl . registerPlaceholder ( placeholder ) ; pl . allUsedPlaceholderIdentifiers . add ( placeholder . getIdentifier ( ) ) ; }
Registers a relational placeholder
 @param placeholder - Placeholder handler
 @since 2.8.0
Registers a relational placeholder @param placeholder - Placeholder handler @since 2 . 8 . 0