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# DTD

The DTD that describes NED XML files:

    <!--
    **
    ** OMNeT++ Network Description (NED)
    **
    **  Characteristics:
    **  - describes NED I.
    **  - values (expressions) may be either unparsed (in attributes) or parsed
    **    (in expression elements).
    **  - display strings stored unparsed
    **  - plusindent missing
    **  - contains limitations of NED grammar:
    **      - for loops cannot contain for loops AND connections;
    **      - connections cannot share condition
    **
    -->

    <!ELEMENT ned-files ((ned-files|ned-file)*)>

    <!ELEMENT ned-file ((import|channel|simple-module|compound-module|network|
                         cppinclude|cpp-struct|cpp-cobject|cpp-noncobject|
                         enum|message|class|struct)*)>
    <!ATTLIST ned-file
         filename            CDATA     #IMPLIED
         preferred-indent    CDATA     "4"
         banner-comment      CDATA     #IMPLIED >

    <!--
      **  NED-I.
      -->

    <!ELEMENT import (imported-file*)>
    <!ATTLIST import
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT imported-file EMPTY>
    <!ATTLIST imported-file
         filename            CDATA     #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT channel (channel-attr*, display-string?)>
    <!ATTLIST channel
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT channel-attr (expression?)>
    <!ATTLIST channel-attr
         name                NMTOKEN   #REQUIRED
         value               CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT network (substmachines?,substparams?)>
    <!ATTLIST network
         name                NMTOKEN   #REQUIRED
         type-name           NMTOKEN   #REQUIRED
         like-name           NMTOKEN   #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT simple-module (machines?, params?, gates?, display-string?)>
    <!ATTLIST simple-module
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT compound-module (machines?, params?, gates?,
                      submodules?, connections?, display-string?)>
    <!ATTLIST compound-module
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT params (param*)>
    <!ATTLIST params
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT param EMPTY>
    <!ATTLIST param
         name                NMTOKEN   #REQUIRED
         data-type           CDATA     "numeric"
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT gates (gate*)>
    <!ATTLIST gates
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT gate EMPTY>
    <!ATTLIST gate
         name                NMTOKEN   #REQUIRED
         direction      (input|output) #REQUIRED
         is-vector       (true|false)  "false"
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT machines (machine*)>
    <!ATTLIST machines
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT machine EMPTY>
    <!ATTLIST machine
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT submodules (submodule*)>
    <!ATTLIST submodules
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT submodule (expression?, substmachines*, substparams*,
                         gatesizes*, display-string?)>
    <!ATTLIST submodule
         name                NMTOKEN   #REQUIRED
         type-name           NMTOKEN   #REQUIRED
         like-name           NMTOKEN   #IMPLIED
         vector-size         CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT substparams (expression?, substparam*)>
    <!ATTLIST substparams
         condition           CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT substparam (expression?)>
    <!ATTLIST substparam
         name                NMTOKEN   #REQUIRED
         value               CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT gatesizes (expression?, gatesize*)>
    <!ATTLIST gatesizes
         condition           CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT gatesize (expression?)>
    <!ATTLIST gatesize
         name                NMTOKEN   #REQUIRED
         vector-size         CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT substmachines (expression?, substmachine*)>
    <!ATTLIST substmachines
         condition           CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT substmachine EMPTY>
    <!ATTLIST substmachine
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT connections ((connection|for-loop)*)>
    <!ATTLIST connections
         check-unconnected (true|false) "true"
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT connection ((expression|conn-attr|display-string)*)>
    <!ATTLIST connection
         condition           CDATA     #IMPLIED
         src-module          NMTOKEN   #IMPLIED
         src-module-index    CDATA     #IMPLIED
         src-gate            NMTOKEN   #REQUIRED
         src-gate-index      CDATA     #IMPLIED
         dest-module         NMTOKEN   #IMPLIED
         dest-module-index   CDATA     #IMPLIED
         dest-gate           NMTOKEN   #REQUIRED
         dest-gate-index     CDATA     #IMPLIED
         arrow-direction  (left|right) "right"
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT conn-attr (expression*)>
    <!ATTLIST conn-attr
         name                NMTOKEN   #REQUIRED
         value               CDATA     #IMPLIED
         right-comment       CDATA     "" >

    <!ELEMENT for-loop (loop-var+,connection*)>
    <!ATTLIST for-loop
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT loop-var (expression*)>
    <!ATTLIST loop-var
         param-name          NMTOKEN   #REQUIRED
         from-value          CDATA     #IMPLIED
         to-value            CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!-- FIXME: should become a property -->
    <!ELEMENT display-string EMPTY>
    <!ATTLIST display-string
         value               CDATA     #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!--
      **  Expressions
      -->

    <!ELEMENT expression ((operator|function|param-ref|ident|const))>
    <!ATTLIST expression
         target              NMTOKEN   #IMPLIED >

    <!ELEMENT operator ((operator|function|param-ref|ident|const)+)>
    <!ATTLIST operator
         name                NMTOKEN   #REQUIRED >

    <!ELEMENT function ((operator|function|param-ref|ident|const)*)>
    <!ATTLIST function
         name                NMTOKEN   #REQUIRED >

    <!ELEMENT param-ref (expression*)>
    <!ATTLIST param-ref
         module              CDATA     #IMPLIED
         module-index        CDATA     #IMPLIED
         param-name          NMTOKEN   #REQUIRED
         param-index         CDATA     #IMPLIED
         is-ref           (true|false) "false"
         is-ancestor      (true|false) "false" >

    <!-- for loop variables, etc. -->
    <!ELEMENT ident EMPTY>
    <!ATTLIST ident
         name                NMTOKEN   #REQUIRED >

    <!ELEMENT const EMPTY>
    <!ATTLIST const
         type  (bool|int|real|string|time)  #REQUIRED
         text                CDATA     #IMPLIED
         value               CDATA     #REQUIRED >

    <!--
      **  NED-II: message subclassing part
      -->
    <!ELEMENT cppinclude EMPTY>
    <!ATTLIST cppinclude
         filename            CDATA     #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!-- C++ type announcements -->

    <!ELEMENT cpp-struct EMPTY>
    <!ATTLIST cpp-struct
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT cpp-cobject EMPTY>
    <!ATTLIST cpp-cobject
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT cpp-noncobject EMPTY>
    <!ATTLIST cpp-noncobject
         name                NMTOKEN   #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!-- Enums -->

    <!ELEMENT enum (enum-fields?)>
    <!ATTLIST enum
         name                NMTOKEN   #REQUIRED
         extends-name        NMTOKEN   #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT enum-fields (enum-field*)>
    <!ATTLIST enum-fields
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT enum-field EMPTY>
    <!ATTLIST enum-field
         name                NMTOKEN   #REQUIRED
         value               CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!-- Message, class, struct -->

    <!ELEMENT message (properties?,fields?)>
    <!ATTLIST message
         name                NMTOKEN   #REQUIRED
         extends-name        NMTOKEN   #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT class (properties?,fields?)>
    <!ATTLIST class
         name                NMTOKEN   #REQUIRED
         extends-name        NMTOKEN   #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT struct (properties?,fields?)>
    <!ATTLIST struct
         name                NMTOKEN   #REQUIRED
         extends-name        NMTOKEN   #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;"
         trailing-comment    CDATA     "&#10;" >

    <!ELEMENT fields (field*)>
    <!ATTLIST fields
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT field EMPTY>
    <!ATTLIST field
         name                NMTOKEN   #REQUIRED
         data-type           CDATA     #REQUIRED
         is-abstract     (true|false)  "false"
         is-vector       (true|false)  "false"
         vector-size         CDATA     #IMPLIED
         enum-name           NMTOKEN   #IMPLIED
         default-value       CDATA     #IMPLIED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT properties (property*)>
    <!ATTLIST properties
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!ELEMENT property EMPTY>
    <!ATTLIST property
         name                NMTOKEN   #REQUIRED
         value               CDATA     #REQUIRED
         banner-comment      CDATA     #IMPLIED
         right-comment       CDATA     "&#10;" >

    <!--
      **  'unknown' is used internally to represent elements not in this NED DTD
      -->
    <!ELEMENT unknown        ANY>
    <!ATTLIST unknown
         element             NMTOKEN   #REQUIRED>