/**
 * NEXUS GEXF export utilities.
 *
 * Generates GEXF (Gephi Graph Exchange XML Format) from nexus graph nodes and
 * relations. Supports node attributes, edge weights (confidence), and color
 * coding by node kind.
 *
 * @task T1473
 */
/**
 * Escape XML special characters.
 *
 * @param str - Input string to escape.
 * @returns XML-safe string.
 *
 * @example
 * escapeXml('<foo>') // '&lt;foo&gt;'
 */
export declare function escapeXml(str: string): string;
/**
 * Convert hex color to RGB object.
 *
 * @param hex - Hex color string (e.g. '#3498db' or '3498db').
 * @returns RGB components.
 *
 * @example
 * hexToRgb('#3498db') // { r: 52, g: 152, b: 219 }
 */
export declare function hexToRgb(hex: string): {
    r: number;
    g: number;
    b: number;
};
/**
 * Generate GEXF (Gephi Graph Exchange XML Format) from nodes and relations.
 *
 * @param nodes - Array of nexus nodes (plain record objects from DB).
 * @param relations - Array of nexus relations (plain record objects from DB).
 * @returns GEXF XML string ready for Gephi or other graph tools.
 *
 * @example
 * const xml = generateGexf(nodes, relations);
 * writeFileSync('graph.gexf', xml);
 */
export declare function generateGexf(nodes: Array<Record<string, unknown>>, relations: Array<Record<string, unknown>>): string;
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