file ::=
  <model [ code="..." ] >
    { data }0+
    [ sources ]
    [ domains ]
    { asset }0+
    { depend }0+
    { value }0+
  </model>

data ::=
  <data key="..." text="..." />

sources ::=
  <sources>
    { source }0+
  </sources>

source ::=
  <source c="...">
    name
    [ <desc> description </desc> }
  </source>

domains ::=
  <domains>
    { domain }0+
  </domains>

domain ::=
  <domain c="..." [ next="..." ]>
    <name> name </name>
    [ <desc> description </desc> ]
  </domain>

asset ::=
  <asset c="..." domain="...">
    name
   { asset_source }0+
   { type }0+
   { data }0+
    [ <note> description </note> ]
  </asset>

asset_source ::=
  <source c="..." />

type ::=
  <type c="..." />

depend ::=
  <depend above="..." below="..." [ degree="..." ] />

value ::=
  general_value | availability_value

general_value ::=
  <value asset="..."
      dim="..."
      acronym="..."
      [ qualitative_value ]
      [ quantitative_value ]
  />

availability_value ::=
  <value asset="..."
      step="..."
    [ qualitative_value ]
    [ quantitative_value ]
  />

qualitative_value ::=
  vl="..."

quantitative_value ::=
  vn="..."