Layout-Descriptors {2 8 1 5 8} DEFINITIONS ::=
BEGIN

EXPORTS
  Layout-Object-Descriptor, Layout-Class-Descriptor, Layout-Object-Type,
    Transparency, Comment-String, Binding-Pair, One-Of-Four-Angles,
    Measure-Pair, Dimension-Pair, Medium-Type, Colour, Border,
    Content-Background-Colour, Content-Foreground-Colour, Enciphered, 
    Sealed;

IMPORTS
  Object-or-Class-Identifier, Style-Identifier, Protected-Part-Identifier,
    Category-Name, Resource-Name, Binding-Name, Construction-Expression,
    Object-Id-Expression, Numeric-Expression, String-Expression
    FROM Identifiers-and-Expressions --  see 7.8 
      
  Presentation-Attributes
    FROM Style-Descriptors --  see 7.11
      
  Default-Value-Lists-Layout
    FROM Default-Value-Lists --  see 7.12
      
  Colour-Expression, Colour-Table
    FROM Colour-Attributes --  see 7.14
      
  Presentation-Time
    FROM Temporal-Relationships {2 8 1 14 0};

--  See ITU-T Rec. T.424 | ISO/IEC 8613-14
Position-Spec ::= SET {
  offset
    [0] IMPLICIT SET {leading     [0] IMPLICIT INTEGER OPTIONAL,
                      trailing    [1] IMPLICIT INTEGER OPTIONAL,
                      left-hand   [2] IMPLICIT INTEGER OPTIONAL,
                      right-hand  [3] IMPLICIT INTEGER OPTIONAL} OPTIONAL,
  separation
    [1] IMPLICIT SET {leading   [0] IMPLICIT INTEGER OPTIONAL,
                      trailing  [1] IMPLICIT INTEGER OPTIONAL,
                      centre    [2] IMPLICIT INTEGER OPTIONAL} OPTIONAL,
  alignment
    [2] IMPLICIT INTEGER {right-hand(0), centred(1), left-hand(2)} OPTIONAL,
  fill-order  [3] IMPLICIT INTEGER {normal(0), reverse(1)} OPTIONAL
}

Dimension-Pair ::= SEQUENCE {
  horizontal
    CHOICE {fixed        [0] IMPLICIT INTEGER,
            not-present  [4] IMPLICIT NULL},
  vertical
    CHOICE {fixed        [0] IMPLICIT INTEGER,
            variable     [1] IMPLICIT INTEGER,
            not-present  [4] IMPLICIT NULL}
}

--  the choice 'not-present' indicates that the parameter is not present
Dimension-Spec ::= SEQUENCE {horizontal  Dimension,
                             vertical    Dimension
}

Dimension ::= CHOICE {
  fixed         [0] IMPLICIT INTEGER,
  rule-a
    [1] IMPLICIT SET {minimum  [0] IMPLICIT INTEGER OPTIONAL,
                      maximum  [1] IMPLICIT INTEGER OPTIONAL},
  rule-b
    [2] IMPLICIT SET {minimum  [0] IMPLICIT INTEGER OPTIONAL,
                      maximum  [1] IMPLICIT INTEGER OPTIONAL},
  maximum-size  [3] IMPLICIT NULL,
  not-present   [4] IMPLICIT NULL
}

--  the choice 'not-present' indicates that the parameter is not present
Transparency ::= INTEGER {transparent(0), opaque(1)}

Comment-String ::= OCTET STRING

--  string of characters from the sets designated by
--  the document profile attribute "comments character sets",
--  plus code extension control functions,
--  space, carriage return and line feed
Binding-Pair ::= SET {
  binding-identifier  [0] IMPLICIT Binding-Name,
  binding-value
    CHOICE {a  [1]  Object-Id-Expression,
            b  [2]  Numeric-Expression,
            c  [3]  String-Expression,
            d  [4] IMPLICIT Object-or-Class-Identifier,
            e  [5] IMPLICIT INTEGER,
            f  [6] IMPLICIT OCTET STRING}
}

One-Of-Four-Angles ::= INTEGER {d0(0), d90(1), d180(2), d270(3)}

Measure-Pair ::= SEQUENCE {
  horizontal
    CHOICE {fixed        [0] IMPLICIT INTEGER,
            not-present  [4] IMPLICIT NULL},
  vertical
    CHOICE {fixed        [0] IMPLICIT INTEGER,
            not-present  [4] IMPLICIT NULL}
}

--  the choice 'not-present' indicates that the parameter is not present
Medium-Type ::= SEQUENCE {
  nominal-page-size  Measure-Pair OPTIONAL,
  side-of-sheet      INTEGER {unspecified(0), recto(1), verso(2)} OPTIONAL,
  colour-of-medium   [3]  Colour-Of-Medium OPTIONAL
}

Colour ::= INTEGER {colour-of-media(0), coloured(1)}

Border ::= SET {
  left-hand-edge   [0] IMPLICIT Border-Edge OPTIONAL,
  right-hand-edge  [1] IMPLICIT Border-Edge OPTIONAL,
  trailing-edge    [2] IMPLICIT Border-Edge OPTIONAL,
  leading-edge     [3] IMPLICIT Border-Edge OPTIONAL
}

Border-Edge ::= SET {
  line-width          [0] IMPLICIT INTEGER OPTIONAL,
  line-type
    [1] IMPLICIT INTEGER {invisible(0), solid(1), dashed(2), dot(3),
                          dash-dot(4), dash-dot-dot(5)} OPTIONAL,
  freespace-width     [2] IMPLICIT INTEGER OPTIONAL,
  border-line-colour  [3]  Border-Line-Colour OPTIONAL
}

--  a 'null' border edge is represented by an empty set
Colour-Of-Medium ::= CHOICE {
  unspecified-colour  [3] IMPLICIT NULL,
  specified-colour    Colour-Expression
}

Border-Line-Colour ::= CHOICE {
  implementation-defined  [3] IMPLICIT NULL,
  colour-expression       Colour-Expression
}

Content-Background-Colour ::= CHOICE {
  content-background-transparency  [2] IMPLICIT NULL,
  colour-expression                Colour-Expression
}

Content-Foreground-Colour ::= CHOICE {
  implementation-defined           [3] IMPLICIT NULL,
  content-foreground-transparency  [2] IMPLICIT NULL,
  colour-expression                Colour-Expression
}

Enciphered ::= SEQUENCE {
  enciphered-subordinates
    CHOICE {none-all  [0] IMPLICIT INTEGER {none(0), all(1)},
            partial   [1] IMPLICIT SEQUENCE OF NumericString},
  protected-part-id        [2] IMPLICIT Protected-Part-Identifier OPTIONAL
}

Sealed ::= SEQUENCE {
  sealed-status  [0] IMPLICIT INTEGER {no(0), yes(1)},
  seal-ids       [1] IMPLICIT SET OF INTEGER OPTIONAL
}

Layout-Object-Descriptor ::= SEQUENCE {
  object-type      Layout-Object-Type OPTIONAL,
  descriptor-body  Layout-Object-Descriptor-Body OPTIONAL
}

Layout-Object-Type ::= INTEGER {
  document-layout-root(0), page-set(1), page(2), frame(3), block(4)}

Layout-Object-Descriptor-Body ::= SET {
  object-identifier             Object-or-Class-Identifier OPTIONAL,
  subordinates                  [0] IMPLICIT SEQUENCE OF NumericString OPTIONAL,
  content-portions              [1] IMPLICIT SEQUENCE OF NumericString OPTIONAL,
  object-class
    [2] IMPLICIT Object-or-Class-Identifier OPTIONAL,
  position                      [3] IMPLICIT Measure-Pair OPTIONAL,
  dimensions                    [4] IMPLICIT Dimension-Pair OPTIONAL,
  transparency                  [5] IMPLICIT Transparency OPTIONAL,
  presentation-attributes       [6] IMPLICIT Presentation-Attributes OPTIONAL,
  default-value-lists
    [7] IMPLICIT Default-Value-Lists-Layout OPTIONAL,
  user-readable-comments        [8] IMPLICIT Comment-String OPTIONAL,
  bindings                      [9] IMPLICIT SET OF Binding-Pair OPTIONAL,
  layout-path                   [11] IMPLICIT One-Of-Four-Angles OPTIONAL,
  imaging-order
    [12] IMPLICIT SEQUENCE OF NumericString OPTIONAL,
  layout-stream-categories      [36] IMPLICIT SET OF Category-Name OPTIONAL,
  layout-stream-sub-categories  [37] IMPLICIT SET OF Category-Name OPTIONAL,
  permitted-categories          [13] IMPLICIT SET OF Category-Name OPTIONAL,
  --  a 'null' value is represented by an empty set
  user-visible-name             [14] IMPLICIT Comment-String OPTIONAL,
  page-position                 [15] IMPLICIT Measure-Pair OPTIONAL,
  medium-type                   [16] IMPLICIT Medium-Type OPTIONAL,
  presentation-style            [17] IMPLICIT Style-Identifier OPTIONAL,
  balance
    [21] IMPLICIT SEQUENCE OF Object-or-Class-Identifier OPTIONAL,
  --  a 'null' value is represented by an empty sequence
  colour                        [22] IMPLICIT Colour OPTIONAL,
  colour-of-layout-object       [29]  Colour-Expression OPTIONAL,
  object-colour-table           [30] IMPLICIT Colour-Table OPTIONAL,
  content-background-colour     [31]  Content-Background-Colour OPTIONAL,
  content-foreground-colour     [32]  Content-Foreground-Colour OPTIONAL,
  content-colour-table          [33] IMPLICIT Colour-Table OPTIONAL,
  border                        [23] IMPLICIT Border OPTIONAL,
  application-comments          [25] IMPLICIT OCTET STRING OPTIONAL,
  primary
    [27] IMPLICIT Object-or-Class-Identifier OPTIONAL,
  alternative
    [28] IMPLICIT Object-or-Class-Identifier OPTIONAL,
  enciphered                    [34] IMPLICIT Enciphered OPTIONAL,
  sealed                        [35] IMPLICIT Sealed OPTIONAL,
  presentation-time             [52] IMPLICIT Presentation-Time OPTIONAL
}

Layout-Class-Descriptor ::= SEQUENCE {
  object-type      Layout-Object-Type,
  descriptor-body  Layout-Class-Descriptor-Body
}

Layout-Class-Descriptor-Body ::= SET {
  object-class-identifier       Object-or-Class-Identifier,
  generator-for-subordinates    [0]  Construction-Expression OPTIONAL,
  content-portions              [1] IMPLICIT SEQUENCE OF NumericString OPTIONAL,
  position
    CHOICE {fixed-position     [3] IMPLICIT Measure-Pair,
            variable-position  [26] IMPLICIT Position-Spec} OPTIONAL,
  dimensions                    [4] IMPLICIT Dimension-Spec OPTIONAL,
  transparency                  [5] IMPLICIT Transparency OPTIONAL,
  presentation-attributes       [6] IMPLICIT Presentation-Attributes OPTIONAL,
  default-value-lists
    [7] IMPLICIT Default-Value-Lists-Layout OPTIONAL,
  user-readable-comments        [8] IMPLICIT Comment-String OPTIONAL,
  bindings                      [9] IMPLICIT SET OF Binding-Pair OPTIONAL,
  content-generator             [10] IMPLICIT String-Expression OPTIONAL,
  layout-path                   [11] IMPLICIT One-Of-Four-Angles OPTIONAL,
  layout-stream-categories      [36] IMPLICIT SET OF Category-Name OPTIONAL,
  layout-stream-sub-categories  [37] IMPLICIT SET OF Category-Name OPTIONAL,
  permitted-categories          [13] IMPLICIT SET OF Category-Name OPTIONAL,
  --  a 'null' value is represented by an empty set
  user-visible-name             [14] IMPLICIT Comment-String OPTIONAL,
  page-position                 [15] IMPLICIT Measure-Pair OPTIONAL,
  medium-type                   [16] IMPLICIT Medium-Type OPTIONAL,
  presentation-style            [17] IMPLICIT Style-Identifier OPTIONAL,
  logical-source
    [18] IMPLICIT Object-or-Class-Identifier OPTIONAL,
  balance
    [21] IMPLICIT SEQUENCE OF Object-or-Class-Identifier OPTIONAL,
  --  a 'null' value is represented by an empty sequence
  colour                        [22] IMPLICIT Colour OPTIONAL,
  colour-of-layout-object       [29]  Colour-Expression OPTIONAL,
  object-colour-table           [30] IMPLICIT Colour-Table OPTIONAL,
  content-background-colour     [31]  Content-Background-Colour OPTIONAL,
  content-foreground-colour     [32]  Content-Foreground-Colour OPTIONAL,
  content-colour-table          [33] IMPLICIT Colour-Table OPTIONAL,
  border                        [23] IMPLICIT Border OPTIONAL,
  resource                      [24] IMPLICIT Resource-Name OPTIONAL,
  application-comments          [25] IMPLICIT OCTET STRING OPTIONAL,
  enciphered                    [34] IMPLICIT Enciphered OPTIONAL,
  sealed                        [35] IMPLICIT Sealed OPTIONAL,
  presentation-time             [52] IMPLICIT Presentation-Time OPTIONAL
}

END