GObject
        GsfDocPropVector
        GsfBlob
        GsfClipData
        GsfDocMetaData
        GsfInput
            GsfInfile
                GsfInfileMSOle
                GsfInfileStdio
                GsfInfileZip
                GsfStructuredBlob
            GsfInputGZip
            GsfInputMemory
            GsfInputProxy
            GsfInputStdio
            GsfInputTextline
        GsfOutput
            GsfOutfile
                GsfOutfileMSOle
                GsfOutfileStdio
                GsfOutfileZip
            GsfOutputBzip
            GsfOutputCsv
            GsfOutputGZip
            GsfOutputIconv
            GsfOutputIOChannel
            GsfOutputMemory
            GsfOutputStdio
        GsfXMLOut
    GBoxed
        GsfTimestamp