Disclosed herein are system, method, and computer program product embodiments for incorporating metadata extensions of various metadata formats into a metadata mapping or graphing function. Extensions for various formats are separately defined with a predetermined syntax. When a metadata object is received, it is scanned to determine whether any extensions are present. When such an extension is detected, the parser is loaded with an extension parsing plugin corresponding to the format of the metadata object. That plugin retrieves extension definitions from a repository in order to accurately parse the extension information of the metadata object. The metadata object and its extensions can then be parsed and graphed accordingly.