private Object resolveMetaDataKey(String metaDataLocalName) {
        Object metaDataKey = metaDataLocalName;
        if ("sf:authors".equals(metaDataQName)) {
            metaDataKey = TikaCoreProperties.CREATOR;
        } else if ("sf:title".equals(metaDataQName)) {
            metaDataKey = TikaCoreProperties.TITLE;
        } else if ("sl:SLCreationDateProperty".equals(metaDataQName)) {
            metaDataKey = TikaCoreProperties.CREATED;
        } else if ("sl:SLLastModifiedDateProperty".equals(metaDataQName)) {
            metaDataKey = TikaCoreProperties.MODIFIED;
        } else if ("sl:language".equals(metaDataQName)) {
            metaDataKey = TikaCoreProperties.LANGUAGE;
        }
        return metaDataKey;
    }
Returns a resolved key that is common in other document types or
returns the specified metaDataLocalName if no common key could be found.
The key could be a simple String key, or could be a {@link Property}

@param metaDataLocalName The localname of the element containing metadata
@return a resolved key that is common in other document types
tika-parsers/tika-parsers-standard/tika-parsers-standard-modules/tika-parser-apple-module/src/main/java/org/apache/tika/parser/iwork/PagesContentHandler.java