/**
 * Well-known legacy property key for content attachment.
 * Stores a content-addressed blob OID as the property value.
 */
export declare const CONTENT_PROPERTY_KEY = "_content";
/**
 * Well-known legacy property key for attached content MIME metadata.
 * Stores a MIME type hint for the attached logical content referenced by `_content`.
 */
export declare const CONTENT_MIME_PROPERTY_KEY = "_content.mime";
/**
 * Well-known legacy property key for attached content byte-size metadata.
 * Stores the byte length of the attached logical content referenced by `_content`.
 */
export declare const CONTENT_SIZE_PROPERTY_KEY = "_content.size";
