namespace a = "http://relaxng.org/ns/compatibility/annotations/1.0"

tree = element tree { attlist.tree,
    (field
     | button)*
  }
attlist.tree &= attribute on_write { text }?
attlist.tree &= attribute editable { "0" | "1" }?
attlist.tree &=
  [ a:defaultValue = "1" ] attribute creatable { "0" | "1" }?
attlist.tree &= attribute sequence { text }?
attlist.tree &=
  [ a:defaultValue = "0" ] attribute keyword_open { "0" | "1" }?
attlist.tree &=
  [ a:defaultValue = "0" ] attribute tree_state { "0" | "1" }?
attlist.tree &= attribute visual { text }?
field = element field { attlist.field, (prefix | suffix)* }
attlist.field &= attribute name { text }
attlist.field &= attribute readonly { "0" | "1" }?
attlist.field &=
  attribute widget {
    "binary"
    | "boolean"
    | "callto"
    | "char"
    | "date"
    | "datetime"
    | "email"
    | "float"
    | "image"
    | "integer"
    | "many2many"
    | "many2one"
    | "multiselection"
    | "numeric"
    | "one2many"
    | "one2one"
    | "progressbar"
    | "reference"
    | "selection"
    | "sip"
    | "text"
    | "time"
    | "timedelta"
    | "url"
  }?
attlist.field &=
  [ a:defaultValue = "0" ] attribute tree_invisible { text }?
attlist.field &= attribute optional { "0" | "1" }?
attlist.field &=
  [ a:defaultValue = "0" ] attribute expand { xsd:integer }?
attlist.field &= attribute visual { text }?
attlist.field &= attribute icon { text }?
attlist.field &= 
  [ a:defaultValue = "0" ] attribute sum { "0" | "1" }?
attlist.field &= attribute width { text }?
attlist.field &= attribute height { text }?
attlist.field &=
  [ a:defaultValue = "1" ] attribute create { "0" | "1" }?
attlist.field &=
  [ a:defaultValue = "1" ] attribute delete { "0" | "1" }?
attlist.field &=
  [ a:defaultValue = "left_to_right" ] attribute orientation {
    "left_to_right"
    | "right_to_left"
    | "bottom_to_top"
    | "top_to_bottom"
  }?
attlist.field &= [a:defaultValue = "0"] attribute pre_validate { "0" | "1" }?
attlist.field &= [a:defaultValue = "1"] attribute completion { "0" | "1" }?
attlist.field &= attribute string { text }?
attlist.field &= [a:defaultValue = "1"] attribute factor { text }?
attlist.field &= attribute filename { text }?
attlist.field &= attribute help_field { text }?
attlist.field &= attribute view_ids { text }?
attlist.field &= attribute symbol { text }?
attlist.field &= [a:defaultValue = "1"] attribute grouping { "0" | "1" }?
prefix = element prefix { attlist.affix, empty }
suffix = element suffix { attlist.affix, empty }
attlist.affix &= attribute string { text }?
attlist.affix &= ( attribute name { text } | attribute id { text } )
attlist.affix &= attribute icon { text }?
attlist.affix &= [a:defaultValue = "icon"] attribute icon_type { "icon" | "url" }?
attlist.affix &= attribute url_size { text }?
attlist.affix &= [a:defaultValue = "square"] attribute border { "square" | "circle" | "rounded" }?
button = element button { attlist.button, empty }
attlist.button &= attribute help { text }?
attlist.button &= attribute string { text }?
attlist.button &= attribute confirm { text }?
attlist.button &= attribute name { text }
attlist.button &= attribute states { text }?
attlist.button &=
    [ a:defaultValue="action" ]
    attribute keyword { "relate" | "print" | "action" }?
attlist.button &= attribute change { text }?
attlist.button &= attribute type { "class" | "instance" }?
attlist.button &=
  [ a:defaultValue = "0" ] attribute tree_invisible { text }?
attlist.button &= attribute width { text }?
data = element data { attlist.data, xpath* }
attlist.data &= empty
xpath = element xpath { attlist.xpath,
    (field
    | prefix
    | suffix
    | button
    | tree
    )*
  }
attlist.xpath &= attribute expr { text }
attlist.xpath &=
  [ a:defaultValue = "inside" ]
  attribute position { "inside" | "replace" | "replace_attributes" | "after" | "before" }?
start = tree | data