version 1.

XmlText = [ string ].

XmlElement = [@name symbol @attrs {string: string ...:...} @elements XmlNode ...].

XmlNode = XmlElement / XmlText .

Svg = [=svg @attrs {string: string ...:...} @elements XmlNode ...].

Xhtml = [=html @attrs {string: string ...:...} @elements XmlNode ...].

Content = Svg / Xhtml .

Svui = <svui @attrs {string: any ...:...} @data Content>.