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LDAP_SCHEMA(3)									   LDAP_SCHEMA(3)

       ldap_str2syntax,  ldap_syntax2str,  ldap_syntax2name,  ldap_syntax_free, ldap_str2matchin-
       grule,	  ldap_matchingrule2str,     ldap_matchingrule2name,	  ldap_matchingrule_free,
       ldap_str2attributetype,	ldap_attributetype2str,  ldap_attributetype2name, ldap_attribute-
       type_free, ldap_str2objectclass, ldap_objectclass2str, ldap_objectclass2name, ldap_object-
       class_free, ldap_scherr2str - Schema definition handling routines

       #include <ldap.h>

       LDAPSyntax * ldap_str2syntax(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_syntax2str(syn)
       const LDAPSyntax * syn;

       const char * ldap_syntax2name(syn)
       LDAPSyntax * syn;

       LDAPSyntax * syn;

       LDAPMatchingRule * ldap_str2matchingrule(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_matchingrule2str(mr);
       const LDAPMatchingRule * mr;

       const char * ldap_matchingrule2name(mr)
       LDAPMatchingRule * mr;

       LDAPMatchingRule * mr;

       LDAPAttributeType * ldap_str2attributetype(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_attributetype2str(at)
       const LDAPAttributeType * at;

       const char * ldap_attributetype2name(at)
       LDAPAttributeType * at;

       LDAPAttributeType * at;

       LDAPObjectClass * ldap_str2objectclass(s, code, errp, flags)
       const char * s;
       int * code;
       const char ** errp;
       const int flags;

       char * ldap_objectclass2str(oc)
       const LDAPObjectClass * oc;

       const char * ldap_objectclass2name(oc)
       LDAPObjectClass * oc;

       LDAPObjectClass * oc;

       char * ldap_scherr2str(code)
       int code;

       These routines are used to parse schema definitions in the syntax defined in RFC 2252 into
       structs and handle these structs.  These routines handle four kinds of  definitions:  syn-
       taxes,  matching rules, attribute types and objectclasses.  For each definition kind, four
       routines are provided.

       ldap_str2xxx() takes a definition in RFC 2252 format in argument  s  as	a  NUL-terminated
       string  and returns, if possible, a pointer to a newly allocated struct of the appropriate
       kind.  The caller is responsible for freeing the struct by  calling  ldap_xxx_free()  when
       not  needed any longer.	The routine returns NULL if some problem happened.  In this case,
       the integer pointed at by argument code will receive an error code (see below the descrip-
       tion  of ldap_scherr2str() for an explanation of the values) and a pointer to a NUL-termi-
       nated string will be placed where requested by argument errp , indicating where	in  argu-
       ment s the error happened, so it must not be freed by the caller.  Argument flags is a bit
       mask of parsing options controlling the relaxation of the syntax recognized.  The  follow-
       ing values are defined:

	      strict parsing according to RFC 2252.

	      permit definitions that do not contain an initial OID.

	      permit quotes around some items that should not have them.

	      permit  a descr instead of a numeric OID in places where the syntax expect the lat-

	      permit that the initial numeric OID contains a prefix in descr format.

	      be very liberal, include all options.

       The structures returned are as follows:

	      typedef struct ldap_schema_extension_item {
		      char *lsei_name;	      /* Extension name */
		      char **lsei_values;     /* Extension values */
	      } LDAPSchemaExtensionItem;

	      typedef struct ldap_syntax {
		      char *syn_oid;	      /* OID */
		      char **syn_names;       /* Names */
		      char *syn_desc;	      /* Description */
		      LDAPSchemaExtensionItem **syn_extensions; /* Extension */
	      } LDAPSyntax;

	      typedef struct ldap_matchingrule {
		      char *mr_oid;	      /* OID */
		      char **mr_names;	      /* Names */
		      char *mr_desc;	      /* Description */
		      int  mr_obsolete;       /* Is obsolete? */
		      char *mr_syntax_oid;    /* Syntax of asserted values */
		      LDAPSchemaExtensionItem **mr_extensions; /* Extensions */
	      } LDAPMatchingRule;

	      typedef struct ldap_attributetype {
		      char *at_oid;	      /* OID */
		      char **at_names;	      /* Names */
		      char *at_desc;	      /* Description */
		      int  at_obsolete;       /* Is obsolete? */
		      char *at_sup_oid;       /* OID of superior type */
		      char *at_equality_oid;  /* OID of equality matching rule */
		      char *at_ordering_oid;  /* OID of ordering matching rule */
		      char *at_substr_oid;    /* OID of substrings matching rule */
		      char *at_syntax_oid;    /* OID of syntax of values */
		      int  at_syntax_len;     /* Suggested minimum maximum length */
		      int  at_single_value;   /* Is single-valued?  */
		      int  at_collective;     /* Is collective? */
		      int  at_no_user_mod;    /* Are changes forbidden through LDAP? */
		      int  at_usage;	      /* Usage, see below */
		      LDAPSchemaExtensionItem **at_extensions; /* Extensions */
	      } LDAPAttributeType;

	      typedef struct ldap_objectclass {
		      char *oc_oid;	      /* OID */
		      char **oc_names;	      /* Names */
		      char *oc_desc;	      /* Description */
		      int  oc_obsolete;       /* Is obsolete? */
		      char **oc_sup_oids;     /* OIDs of superior classes */
		      int  oc_kind;	      /* Kind, see below */
		      char **oc_at_oids_must; /* OIDs of required attribute types */
		      char **oc_at_oids_may;  /* OIDs of optional attribute types */
		      LDAPSchemaExtensionItem **oc_extensions; /* Extensions */
	      } LDAPObjectClass;

       Some integer fields (those described with a question mark) have a truth value,  for  these
       fields the possible values are:

	      The answer to the question is no.

	      The answer to the question is yes.

       For attribute types, the following usages are possible:

	      the attribute type is non-operational.

	      the attribute type is operational and is pertinent to the directory itself, i.e. it
	      has the same value on all servers that master the entry containing  this	attribute

	      the  attribute  type  is	operational and is pertinent to replication, shadowing or
	      other distributed directory aspect.  TBC.

	      the attribute type is operational and is pertinent to the directory server  itself,
	      i.e.  it may have different values for the same entry when retrieved from different
	      servers that master the entry.

       Object classes can be of three kinds:

	      the object class is abstract, i.e. there cannot be entries of this class alone.

	      the object class is structural, i.e. it describes the main role of the  entry.   On
	      some  servers,  once  the  entry	is  created  the set of structural object classes
	      assigned cannot be changed: none of those present can be removed and none other can
	      be added.

	      the  object  class  is auxiliary, i.e. it is intended to go with other, structural,
	      object classes.  These can be added or removed at any time if attribute  types  are
	      added  or removed at the same time as needed by the set of object classes resulting
	      from the operation.

       Routines ldap_xxx2name() return a canonical name for the definition.

       Routines ldap_xxx2str() return a string representation in the format described by RFC 2252
       of the struct passed in the argument.  The string is a newly allocated string that must be
       freed by the caller.  These routines may return NULL if no memory can be allocated for the

       ldap_scherr2str()  returns  a  NUL-terminated  string with a text description of the error
       found.  This is a pointer to a static area, so it must not be freed by  the  caller.   The
       argument code comes from one of the parsing routines and can adopt the following values:

	      Out of memory.

	      Unexpected token.

	      Missing opening parenthesis.

	      Missing closing parenthesis.

	      Expecting digit.

	      Expecting a name.

	      Bad description.

	      Bad superiors.

	      Duplicate option.

	      Unexpected end of data.


       OpenLDAP  is  developed and maintained by The OpenLDAP Project (http://www.openldap.org/).
       OpenLDAP is derived from University of Michigan LDAP 3.3 Release.

OpenLDAP 2.0.27-Release 		   4 June 2000				   LDAP_SCHEMA(3)
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