<!ELEMENT Document ((Network|Parameter)*)>
<!ATTLIST Document>

<!ELEMENT Network ((Node|Link|NetInput|NetOutput|NetCondition)*)>
<!ATTLIST Network
    type CDATA #REQUIRED
    name CDATA #REQUIRED
    category CDATA #IMPLIED>

<!ELEMENT Node (Parameter*)>
<!ATTLIST Node
    name CDATA #REQUIRED
    type CDATA #REQUIRED
    x CDATA #REQUIRED
    y CDATA #REQUIRED>

<!ELEMENT Parameter EMPTY>
<!ATTLIST Parameter
    name CDATA #REQUIRED
    type CDATA #IMPLIED
    value CDATA #IMPLIED>

<!ELEMENT Link EMPTY>
<!ATTLIST Link
    from CDATA #REQUIRED
    output CDATA #REQUIRED
    to CDATA #REQUIRED
    input CDATA #REQUIRED>

<!ELEMENT NetInput EMPTY>
<!ATTLIST NetInput
    name CDATA #REQUIRED
    node CDATA #REQUIRED
    terminal CDATA #REQUIRED>

<!ELEMENT NetOutput EMPTY>
<!ATTLIST NetOutput
    name CDATA #REQUIRED
    node CDATA #REQUIRED
    terminal CDATA #REQUIRED>

<!ELEMENT NetCondition EMPTY>
<!ATTLIST NetCondition
    name CDATA #REQUIRED
    node CDATA #REQUIRED
    terminal CDATA #REQUIRED>