XML.Element

An element that has attributes or child elements, in the compact shape.

• "@name" — one per attribute, holding its value.
• "#text" — the element's own character data, exactly, when it has any: its text runs concatenated, leaving out only whitespace-only runs that sit between child elements (layout).
• any other key — a child element name, holding that child's Value, or an array of them when the name occurs more than once in this element.

Keys are in document order: attributes first, then child names and "#text" in order of first appearance. @ and # cannot begin an XML name, so these keys never collide with element names.