Method onStartTagOpen

xml/_parser.ts:195–228

(
    name: string,
    line: number,
    column: number,
    offset: number,
  )

  // XmlTokenCallbacks implementation

  onStartTagOpen(
    name: string,
    line: number,
    column: number,
    offset: number,
  ): void {
    const colonIndex = name.indexOf(":");

    // Validate QName syntax (Namespaces §3)
    const qnameError = validateQName(name, colonIndex);
    if (qnameError) {
      throw new XmlSyntaxError(
        `Invalid element name '${name}': ${qnameError}`,
        { line, column, offset },
      );
    }

    // Elements cannot use xmlns prefix (Namespaces 1.0 errata NE08)
    if (colonIndex !== -1 && name.startsWith("xmlns:")) {
      throw new XmlSyntaxError(
        "Element name cannot use the 'xmlns' prefix",
        { line, column, offset },
      );
    }

    this.#pendingName = name;
    this.#pendingColonIndex = colonIndex;
    this.#pendingLine = line;
    this.#pendingColumn = column;
    this.#pendingOffset = offset;
    this.#hasPendingElement = true;
    this.#attrIterator._reset();
    this.#pendingNsBindings.length = 0; // Reset for new element
  }

  onAttribute(name: string, value: string): void {
    if (this.#hasPendingElement) {