public boolean isMultiValued(final Property property) {
        return metadata.get(property.getName()) != null &&
                metadata.get(property.getName()).length > 1;
    }
Returns true if named value is multivalued.

@param property metadata property
@return true is named value is multivalued, false if single value or null
tika-core/src/main/java/org/apache/tika/metadata/Metadata.java