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// Copyright 2017 Baliance. All rights reserved.
// Use of this source code is governed by the terms of the Affero GNU General
// Public License version 3.0 as published by the Free Software Foundation and
// appearing in the file LICENSE included in the packaging of this file. A
// commercial license can be purchased by contacting
package unioffice
import (
// Any is the interface used for marshaling/unmarshaling xsd:any
type Any interface {
MarshalXML(e *xml.Encoder, start xml.StartElement) error
UnmarshalXML(d *xml.Decoder, start xml.StartElement) error
var creatorFns = map[string]interface{}{}
// RegisterConstructor registers a constructor function used for unmarshaling
// xsd:any elements.
func RegisterConstructor(ns, name string, fn interface{}) {
creatorFns[ns+"/"+name] = fn
// CreateElement creates an element with the given namespace and name. It is
// used to unmarshal some xsd:any elements to the appropriate concrete type.
func CreateElement(start xml.StartElement) (Any, error) {
fn, ok := creatorFns[start.Name.Space+"/"+start.Name.Local]
if !ok {
r := &XSDAny{}
return r, nil
v := reflect.ValueOf(fn)
res := v.Call(nil)
if len(res) != 1 {
return nil, fmt.Errorf("constructor function should return one value, got %d", len(res))
any, ok := res[0].Interface().(Any)
if !ok {
return nil, errors.New("constructor function should return any 'Any'")
return any, nil
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