private void addMultiProperty(Metadata metadata, Property property, Optional<String> value) {
        if (!value.isPresent()) {
            return;
        }
        SummaryExtractor.addMulti(metadata, property, value.get());
    }
OOXML metadata extractor.
<p/>
Currently POI doesn't support metadata extraction for OOXML.

@see OOXMLExtractor#getMetadataExtractor()
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-microsoft-module/src/main/java/org/apache/tika/parser/microsoft/ooxml/MetadataExtractor.java