protected void endSN() {
        sn = sb.toString();
    }
This class buffers data from embedded objects and pictures.
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When the parser has finished an object or picture and called
{@link #handleCompletedObject()}, this will write the object
to the {@link #handler}.
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This (in combination with TextExtractor) expects basically a flat parse.  It will pull out
all pict whether they are tied to objdata or are intended
to be standalone.
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This tries to pull metadata around a pict that is encoded
with {sp {sn} {sv}} types of data.  This information
sometimes contains the name and even full file path of the original file.
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/rtf/RTFEmbObjHandler.java