default namespace = "http://www.xmlmind.com/xmleditor/schema/example3"
namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

start = doc-element

doc-element = element doc {
    para-element+
}

para-element = element para {
    mixed {
        [ a:defaultValue = "left" ]
        attribute align { "left" | "center" | "right" }?
    }
}

