:sig
String xml_encode(DValue t)
String xml_encode(DValue t, String root_name)

:params
t : tree to serialize as XML
root_name : optional element name to use when `t` is not already an element-shaped tree, defaults to `root`
return value : XML string

:see
>markup
xml_decode
json_encode
0_DValue
html_escape

:content
Serializes a `DValue` into a simple XML string.

`xml_encode()` does not validate against a schema, DTD, or namespace rules. It is a structural converter for application data, similar in spirit to `json_encode()`.

Try the live example in the [XML demo](../demo/xml.uce).

The native element shape is:


Example:


The result is:


For simple map/list/scalar trees, `xml_encode()` creates ordinary child elements:


Result:


Notes:

- Element and attribute names are normalized to XML-name-safe strings when needed.
- Text and attribute values are escaped.
- List values use repeated `<item>` children.
- Empty elements serialize as self-closing tags.
- Map child order follows `DValue` map iteration order.

:example
DValue value;
value["name"] = "Ada";
print(xml_encode(value) != "" ? "xml\n" : "empty\n");