dgnlib.h

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    short       celltype;          /*!< Cell type. */
    short       attindx;           /*!< Attribute linkage. */
    char        name[7];           /*!< Cell name */

    int         numwords;          /*!< Number of words in cell definition */

    short       dispsymb;          /*!< Display symbol */
 unsigned short cclass;            /*!< Class bitmap */
 unsigned short levels[4];         /*!< Levels used in cell */

    char        description[28];   /*!< Description */
    
} DGNElemCellLibrary;

/** 
 * Shared Cell Definition.
 *
 * The core.stype code is DGNST_SHARED_CELL_DEFN.
 *
 * Returned for DGNT_SHARED_CELL_DEFN(2).
 */

typedef struct {
    DGNElemCore core;

    int         totlength;         /*!< Total length of cell in words,
                                        excluding the first 19 words
                                        (header + totlength field) */
  // FIXME: Most of the contents of this element type is currently
  // unknown. Please get in touch with the authors if you have
  // information about how to decode this element.
} DGNElemSharedCellDefn;

typedef union { char *string; GInt32 integer; double real; } tagValueUnion;

/** 
 * Tag Value.
 *
 * The core.stype code is DGNST_TAG_VALUE.
 *
 * Returned for DGNT_TAG_VALUE(37).
 */

typedef struct {
    DGNElemCore core;

    int         tagType;           /*!< Tag type indicator, DGNTT_* */
    int         tagSet;            /*!< Which tag set does this relate to? */
    int         tagIndex;          /*!< Tag index within tag set. */
    int         tagLength;         /*!< Length of tag information (text) */
    tagValueUnion tagValue;        /*!< Textual value of tag */

} DGNElemTagValue;

/**
 * Tag definition.
 *
 * Structure holding definition of one tag within a DGNTagSet.
 */
typedef struct _DGNTagDef {
    char        *name;      /*!< Name of this tag. */
    int         id;         /*!< Tag index/identifier. */
    char        *prompt;    /*!< User prompt when requesting value. */
    int         type;       /*!< Tag type (one of DGNTT_STRING(1), DGNTT_INTEGER(3) or DGNTT_FLOAT(4). */
    tagValueUnion defaultValue; /*!< Default tag value */
} DGNTagDef;

#define DGNTT_STRING      1
#define DGNTT_INTEGER     3
#define DGNTT_FLOAT       4

/** 
 * Tag Set.
 *
 * The core.stype code is DGNST_TAG_SET.
 *
 * Returned for DGNT_APPLICATION_ELEM(66), Level: 24.
 */

typedef struct {
    DGNElemCore core;

    int        tagCount;    /*!< Number of tags in tagList. */
    int        tagSet;      /*!< Tag set index. */
    int        flags;       /*!< Tag flags - not too much known. */
    char       *tagSetName; /*!< Tag set name. */

    DGNTagDef  *tagList;    /*!< List of tag definitions in this set. */

} DGNElemTagSet;

/** 
 * Cone element 
 *
 * The core.stype code is DGNST_CONE.
 *
 * Used for: DGNT_CONE(23)
 */
typedef struct {
  DGNElemCore core;

  short unknown;     /*!< Unknown data */
  int quat[4];      /*!< Orientation quaternion */
  DGNPoint center_1; /*!< center of first circle */
  double radius_1;   /*!< radius of first circle */
  DGNPoint center_2; /*!< center of second circle */
  double radius_2;   /*!< radius of second circle */

} DGNElemCone;


/** 
 * Text Node Header. 
 *
 * The core.stype code is DGNST_TEXT_NODE.
 *
 * Used for DGNT_TEXT_NODE (7).
 * First fields (up to numelems) are compatible with DGNT_COMPLEX_HEADER (7),
 * \sa DGNAddRawAttrLink()
 */

typedef struct {
  DGNElemCore core;
 
  int       totlength; 	 	/*!<  Total length of the node
				      (bytes = totlength * 2 + 38) */
  int       numelems;    	/*!<  Number of text strings */
  int       node_number; 	/*!<  text node number */
  short     max_length;  	/*!<  maximum length allowed, characters */
  short     max_used;    	/*!<  maximum length used */
  short	    font_id;     	/*!<  text font used */
  short     justification; 	/*!<  justification type, see DGNJ_ */
  long      line_spacing; 	/*!<  spacing between text strings */
  double    length_mult; 	/*!<  length multiplier */
  double    height_mult; 	/*!<  height multiplier */
  double    rotation;    	/*!<  rotation angle (2d)*/
  DGNPoint  origin;       	/*!<  Snap origin (as defined by user) */

} DGNElemTextNode;


/** 
 * B-Spline Surface Header element 
 *
 * The core.stype code is DGNST_BSPLINE_SURFACE_HEADER.
 *
 * Used for: DGNT_BSPLINE_SURFACE_HEADER(24)
 */
typedef struct {
  DGNElemCore core;

  long desc_words;               /*!< Total length of B-Spline surface in
                                      words, excluding the first 20 words
                                      (header + desc_words field) */
  unsigned char curve_type;      /*!< curve type */
  unsigned char u_order;         /*!< B-spline U order: 2-15 */
  unsigned short u_properties;   /*!< surface U properties: 
                                      ORing of DGNBSC_ flags */
  short num_poles_u;             /*!< number of poles */
  short num_knots_u;             /*!< number of knots */
  short rule_lines_u;            /*!< number of rule lines */

  unsigned char v_order;         /*!< B-spline V order: 2-15 */
  unsigned short v_properties;   /*!< surface V properties: 
                                      Oring of DGNBSS_ flags */
  short num_poles_v;             /*!< number of poles */
  short num_knots_v;             /*!< number of knots */
  short rule_lines_v;            /*!< number of rule lines */

  short num_bounds;              /*!< number of boundaries */
} DGNElemBSplineSurfaceHeader;

/** 
 * B-Spline Curve Header element 
 *
 * The core.stype code is DGNST_BSPLINE_CURVE_HEADER.
 *
 * Used for: DGNT_BSPLINE_CURVE_HEADER(27)
 */
typedef struct {
  DGNElemCore core;

  long desc_words;               /*!< Total length of B-Spline curve in words,
                                      excluding the first 20 words
                                      (header + desc_words field) */
  unsigned char order;           /*!< B-spline order: 2-15 */
  unsigned char properties;      /*!< Properties: ORing of DGNBSC_ flags */
  unsigned char curve_type;      /*!< curve type */
  short num_poles;               /*!< number of poles, max. 101 */
  short num_knots;               /*!< number of knots */
} DGNElemBSplineCurveHeader;

/** 
 * B-Spline Surface Boundary element 
 *
 * The core.stype code is DGNST_BSPLINE_SURFACE_BOUNDARY
 *
 * Used for: DGNT_BSPLINE_SURFACE_BOUNDARY(25)
 */
typedef struct {
  DGNElemCore core;

  short number;         /*!< boundary number */
  short numverts;       /*!< number of boundary vertices */
  DGNPoint vertices[1]; /*!< Array of 1 or more 2D boundary vertices
                            (in UV space) */
} DGNElemBSplineSurfaceBoundary;

/** 
 * B-Spline Knot/Weight element 
 *
 * The core.stype code is DGNST_KNOT_WEIGHT
 *
 * Used for: DGNT_BSPLINE_KNOT(26), DGNT_BSPLINE_WEIGHT_FACTOR(28)
 */
typedef struct {
  DGNElemCore core;

  float array[1];         /*!< array (variable length). Length is
                             given in the corresponding B-Spline
                             header. */
} DGNElemKnotWeight;


/* -------------------------------------------------------------------- */
/*      Structure types                                                 */
/* -------------------------------------------------------------------- */

/** DGNElemCore style: Element uses DGNElemCore structure */
#define DGNST_CORE                 1 

/** DGNElemCore style: Element uses DGNElemMultiPoint structure */
#define DGNST_MULTIPOINT           2 

/** DGNElemCore style: Element uses DGNElemColorTable structure */
#define DGNST_COLORTABLE           3 

/** DGNElemCore style: Element uses DGNElemTCB structure */
#define DGNST_TCB                  4 

/** DGNElemCore style: Element uses DGNElemArc structure */
#define DGNST_ARC                  5 

/** DGNElemCore style: Element uses DGNElemText structure */
#define DGNST_TEXT                 6 

/** DGNElemCore style: Element uses DGNElemComplexHeader structure */
#define DGNST_COMPLEX_HEADER       7

/** DGNElemCore style: Element uses DGNElemCellHeader structure */
#define DGNST_CELL_HEADER          8

/** DGNElemCore style: Element uses DGNElemTagValue structure */
#define DGNST_TAG_VALUE            9

/** DGNElemCore style: Element uses DGNElemTagSet structure */
#define DGNST_TAG_SET             10

/** DGNElemCore style: Element uses DGNElemCellLibrary structure */
#define DGNST_CELL_LIBRARY        11

/** DGNElemCore style: Element uses DGNElemCone structure */
#define DGNST_CONE                12

/** DGNElemCore style: Element uses DGNElemTextNode structure */
#define DGNST_TEXT_NODE           13

/** DGNElemCore style: Element uses DGNElemBSplineSurfaceHeader structure */
#define DGNST_BSPLINE_SURFACE_HEADER   14

/** DGNElemCore style: Element uses DGNElemBSplineCurveHeader structure */
#define DGNST_BSPLINE_CURVE_HEADER     15

/** DGNElemCore style: Element uses DGNElemBSplineSurfaceBoundary structure */
#define DGNST_BSPLINE_SURFACE_BOUNDARY 16

/** DGNElemCore style: Element uses DGNElemKnotWeight structure */
#define DGNST_KNOT_WEIGHT              17

/** DGNElemCore style: Element uses DGNElemSharedCellDefn structure */
#define DGNST_SHARED_CELL_DEFN         18


/* -------------------------------------------------------------------- */
/*      Element types                                                   */
/* -------------------------------------------------------------------- */
#define DGNT_CELL_LIBRARY              1
#define DGNT_CELL_HEADER               2
#define DGNT_LINE                      3
#define DGNT_LINE_STRING               4
#define DGNT_GROUP_DATA                5
#define DGNT_SHAPE                     6
#define DGNT_TEXT_NODE                 7
#define DGNT_DIGITIZER_SETUP           8
#define DGNT_TCB                       9