/** Canonical persisted reference: xopc-attachment://notes/{noteId}/{attachmentId} */
export declare const NOTE_ATTACHMENT_SCHEME = "xopc-attachment";
export type ParsedNoteAttachmentRef = {
    noteId: string;
    attachmentId: string;
};
export declare function buildNoteAttachmentRef(noteId: string, attachmentId: string): string;
export declare function parseNoteAttachmentTarget(target: string, expectedNoteId?: string): ParsedNoteAttachmentRef | null;
export declare function attachmentIdFromTarget(target: string, noteId: string): string | undefined;