export declare const ELEMENT_APPEND_ATTRIBUTE_QUALIFIER_START = "";
export declare const ELEMENT_APPEND_ATTRIBUTE_QUALIFIER_END = "+";
/**
 * Returns true if the given attribute name is wrapped in the append-attribute qualifiers
 * @param {string} name
 * @returns {boolean}
 */
export declare function matchesAppendAttributeQualifier(name: string): boolean;
/**
 * Makes an append attribute normalized (e.g. look like a proper attribute)
 * @param {string} name
 * @returns {boolean}
 */
export declare function normalizeAppendAttribute(name: string): string;