/* ** (c) COPYRIGHT MIT 1995. ** Please first read the full copyright statement in the file COPYRIGH. */This module is a part of the W3C Reference Library.
#ifndef HTSTRUCT_H #define HTSTRUCT_H #include "HTStream.h" #include "HTList.h"A structured object is something which can reasonably be represented in for eaxmple SGML. I'll rephrase that. A structured object is am ordered tree-structured arrangement of data which is representable as text. An example is the SGML parser which outputs to a
Structured Object. A Structured object can output its
contents to another Structured Object. It's a kind of
typed stream. The architecure is largely Dan Conolly's. Elements and
entities are passed to the sob by number, implying a knowledge of the
DTD.
The Streuctured Stream is a subclass of a Generic Stream Object. As always, we don't
have classes in basic C so we have to do this by hand! 
NOTE: The put_block method was write,
but this upset systems which had macros for write(). See
the Generic Stream Definition for valid
return codes.
typedef struct _HTStructured HTStructured;
typedef struct _HTStructuredClass {
    char * name;
    int (*flush)	(HTStructured * me);
    int (*_free)	(HTStructured *	me);
    int (*abort)	(HTStructured *	me, HTList * errorlist);
    int (*put_character)(HTStructured *	me, char ch);
    int (*put_string)	(HTStructured *	me, CONST char * str);
    int (*put_block)	(HTStructured * me, CONST char * str, int len);
See the Generic Stream Definition for an
explanation of these methods. Note that they all have a
HTStructured object a the parameter, not a generic
stream. This is to avoid incompatible pointer warnings
    void (*start_element)(HTStructured *me,
			  int		element_number,
			  CONST BOOL *	attribute_present,
			  CONST char **	attribute_value);
    void (*end_element)	(HTStructured *	me, int element_number);
    void (*put_entity)	(HTStructured *	me, int entity_number);
		
} HTStructuredClass;
#endif
End of Structured Stream definition