import { HsonNode } from "../../../../core/types.js";
/**
 * XML namespace URI for SVG elements.
 */
export declare const SVG_NS = "http://www.w3.org/2000/svg";
/**
 * XML namespace URI for HTML elements.
 */
export declare const HTML_NS = "http://www.w3.org/1999/xhtml";
/**
 * Detect whether a string looks like an SVG fragment.
 *
 * @param s - Raw markup string to test.
 * @returns True when the string begins with an `<svg ...>` tag.
 */
export declare const is_svg_markup: (s: string) => boolean;
/**
 * Convert an SVG DOM `Element` subtree into an Hson node tree.
 *
 * Namespace / intent:
 * - Intended for SVG elements (namespace-aware pipelines can route here when `el.namespaceURI === SVG_NS`
 *   or when `isSvgMarkup(...)` detects `<svg ...>` input).
 * - Tag names are normalized to lowercase for stable serialization (`<viewBox>` attributes remain verbatim).
 *
 * Attribute handling:
 * - Routes `quid` through canonical protected metadata assignment.
 * - Copies every other attribute as-is into `$_attrs` except for the established
 *   `xlink:href` → `href` alias when no literal `href` is present.
 * - This preserves SVG-specific casing and names like `viewBox` and `stroke-width`.
 *
 * Child handling:
 * - Element children become nested Hson nodes via recursive conversion.
 * - Text nodes become `_hson_str` leaves with the raw text content preserved (including whitespace).
 * - Other node types (comments, processing instructions, etc.) are ignored.
 *
 * Output shape:
 * - Produces a canonical node and omits empty attribute/metadata containers.
 *
 * @param el - The root SVG `Element` to convert.
 * @returns An `HsonNode` representing `el` and its SVG subtree.
 */
export declare function node_from_svg(el: Element): HsonNode;
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