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

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