addNamespace(i) {
    this.namespaces.has(i) || (this.namespaces.set(i, {
      id: i,
      classes: /* @__PURE__ */ new Map(),
      children: {},
      domId: pe + i + "-" + this.namespaceCounter
    }), this.namespaceCounter++);
  }
Function called by parser when a namespace definition has been found.

@param id - Id of the namespace to add
@public