private ObjectPropertyMap getMap(String type, boolean create) {
		String property = getPropertyName(type);
		ObjectPropertyMap map = null;
		map = propertyMgr.getObjectPropertyMap(property);
		if (map == null) {
			if (create) {
				try {
					map = propertyMgr.createObjectPropertyMap(property, OldBookmark.class);
				}
				catch (DuplicateNameException e) {
					throw new RuntimeException("Unexpected Error");
				}
			}
		}
		return map;
	}
Get the bookmark property name for a specified bookmark type.
@param bookmarkType
@return property used to store bookmarks or null if a
null type was specified.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/database/bookmark/OldBookmarkManager.java