@Override
    public void startEmbeddedDocument(ContentHandler contentHandler, Metadata metadata)
            throws SAXException {
        super.startEmbeddedDocument(contentHandler, metadata);
    }
This is called before parsing an embedded document

@param contentHandler - local content handler to use on the embedded document
@param metadata       metadata to use for the embedded document
@throws SAXException
tika-core/src/main/java/org/apache/tika/sax/RecursiveParserWrapperHandler.java