void* (*get)(struct _gfxdocument*gfx, char*name);
void (*destroy)(struct _gfxdocument*gfx);
void (*set_parameter)(struct _gfxdocument*gfx, char*name, char*value);
void* (*get)(struct _gfxdocument*gfx, char*name);
void (*destroy)(struct _gfxdocument*gfx);
void (*set_parameter)(struct _gfxdocument*gfx, char*name, char*value);