'wild card' value), or if they are equal.

                 A 'family' of subtrees is the set of subtrees defined
                 by a particular combination of values of
                 vacmViewTreeFamilySubtree and vacmViewTreeFamilyMask.
                 In the case where no 'wild card' is defined in the
                 vacmViewTreeFamilyMask, the family of subtrees reduces
                 to a single subtree.

                 When creating or changing MIB views, an SNMP Command

                 Generator application should utilize the
                 vacmViewSpinLock to try to avoid collisions. See
                 DESCRIPTION clause of vacmViewSpinLock.

                 When creating MIB views, it is strongly advised that
                 first the 'excluded' vacmViewTreeFamilyEntries are
                 created and then the 'included' entries.

                 When deleting MIB views, it is strongly advised that
                 first the 'included' vacmViewTreeFamilyEntries are
                 deleted and then the 'excluded' entries.

                 If a create for an entry for instance-level access
                 control is received and the implementation does not
                 support instance-level granularity, then an
                 inconsistentName error must be returned.
                "
    ::= { vacmMIBViews 2 }

vacmViewTreeFamilyEntry OBJECT-TYPE
    SYNTAX       VacmViewTreeFamilyEntry
    MAX-ACCESS   not-accessible
    STATUS       current
    DESCRIPTION "Information on a particular family of view subtrees
                 included in or excluded from a particular SNMP
                 context's MIB view.

                 Implementations must not restrict the number of
                 families of view subtrees for a given MIB view,
                 except as dictated by resource constraints on the
                 overall number of entries in the
                 vacmViewTreeFamilyTable.

                 If no conceptual rows exist in this table for a given
                 MIB view (viewName), that view may be thought of as
                 consisting of the empty set of view subtrees.
                "
    INDEX       { vacmViewTreeFamilyViewName,
                  vacmViewTreeFamilySubtree
                }
    ::= { vacmViewTreeFamilyTable 1 }

VacmViewTreeFamilyEntry ::= SEQUENCE
    {
        vacmViewTreeFamilyViewName     SnmpAdminString,
        vacmViewTreeFamilySubtree      OBJECT IDENTIFIER,
        vacmViewTreeFamilyMask         OCTET STRING,
        vacmViewTreeFamilyType         INTEGER,
        vacmViewTreeFamilyStorageType  StorageType,
        vacmViewTreeFamilyStatus       RowStatus
    }

vacmViewTreeFamilyViewName OBJECT-TYPE
    SYNTAX       SnmpAdminString (SIZE(1..32))
    MAX-ACCESS   not-accessible
    STATUS       current
    DESCRIPTION "The human readable name for a family of view subtrees.
                "
    ::= { vacmViewTreeFamilyEntry 1 }

vacmViewTreeFamilySubtree OBJECT-TYPE
    SYNTAX       OBJECT IDENTIFIER
    MAX-ACCESS   not-accessible
    STATUS       current
    DESCRIPTION "The MIB subtree which when combined with the
                 corresponding instance of vacmViewTreeFamilyMask
                 defines a family of view subtrees.
                "
    ::= { vacmViewTreeFamilyEntry 2 }

vacmViewTreeFamilyMask OBJECT-TYPE
    SYNTAX       OCTET STRING (SIZE (0..16))
    MAX-ACCESS   read-create
    STATUS       current
    DESCRIPTION "The bit mask which, in combination with the
                 corresponding instance of vacmViewTreeFamilySubtree,
                 defines a family of view subtrees.

                 Each bit of this bit mask corresponds to a
                 sub-identifier of vacmViewTreeFamilySubtree, with the
                 most significant bit of the i-th octet of this octet
                 string value (extended if necessary, see below)
                 corresponding to the (8*i - 7)-th sub-identifier, and
                 the least significant bit of the i-th octet of this
                 octet string corresponding to the (8*i)-th
                 sub-identifier, where i is in the range 1 through 16.

                 Each bit of this bit mask specifies whether or not
                 the corresponding sub-identifiers must match when
                 determining if an OBJECT IDENTIFIER is in this
                 family of view subtrees; a '1' indicates that an
                 exact match must occur; a '0' indicates 'wild card',
                 i.e., any sub-identifier value matches.

                 Thus, the OBJECT IDENTIFIER X of an object instance
                 is contained in a family of view subtrees if, for

                 each sub-identifier of the value of
                 vacmViewTreeFamilySubtree, either:

                   the i-th bit of vacmViewTreeFamilyMask is 0, or

                   the i-th sub-identifier of X is equal to the i-th
                   sub-identifier of the value of
                   vacmViewTreeFamilySubtree.

                 If the value of this bit mask is M bits long and
                 there are more than M sub-identifiers in the
                 corresponding instance of vacmViewTreeFamilySubtree,
                 then the bit mask is extended with 1's to be the
                 required length.

                 Note that when the value of this object is the
                 zero-length string, this extension rule results in
                 a mask of all-1's being used (i.e., no 'wild card'),
                 and the family of view subtrees is the one view
                 subtree uniquely identified by the corresponding
                 instance of vacmViewTreeFamilySubtree.

                 Note that masks of length greater than zero length
                 do not need to be supported. In this case this
                 object is made read-only.
                "
    DEFVAL      { ''H }
    ::= { vacmViewTreeFamilyEntry 3 }

vacmViewTreeFamilyType OBJECT-TYPE
    SYNTAX       INTEGER  { included(1), excluded(2) }
    MAX-ACCESS   read-create
    STATUS       current
    DESCRIPTION "Indicates whether the corresponding instances of
                 vacmViewTreeFamilySubtree and vacmViewTreeFamilyMask
                 define a family of view subtrees which is included in
                 or excluded from the MIB view.
                "
    DEFVAL      { included }
    ::= { vacmViewTreeFamilyEntry 4 }

vacmViewTreeFamilyStorageType OBJECT-TYPE
    SYNTAX       StorageType
    MAX-ACCESS   read-create
    STATUS       current
    DESCRIPTION "The storage type for this conceptual row.

                 Conceptual rows having the value 'permanent' need not

                 allow write-access to any columnar objects in the row.
                "
    DEFVAL      { nonVolatile }
    ::= { vacmViewTreeFamilyEntry 5 }

vacmViewTreeFamilyStatus OBJECT-TYPE
    SYNTAX       RowStatus
    MAX-ACCESS   read-create
    STATUS       current
    DESCRIPTION "The status of this conceptual row.

                 The  RowStatus TC [RFC2579] requires that this
                 DESCRIPTION clause states under which circumstances
                 other objects in this row can be modified:

                 The value of this object has no effect on whether
                 other objects in this conceptual row can be modified.
                "
    ::= { vacmViewTreeFamilyEntry 6 }

-- Conformance information *******************************************

vacmMIBCompliances  OBJECT IDENTIFIER ::= { vacmMIBConformance 1 }
vacmMIBGroups       OBJECT IDENTIFIER ::= { vacmMIBConformance 2 }

-- Compliance statements *********************************************

vacmMIBCompliance MODULE-COMPLIANCE
    STATUS       current
    DESCRIPTION "The compliance statement for SNMP engines which
                 implement the SNMP View-based Access Control Model
                 configuration MIB.
                "
    MODULE -- this module
        MANDATORY-GROUPS { vacmBasicGroup }

        OBJECT        vacmAccessContextMatch
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmAccessReadViewName
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmAccessWriteViewName
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmAccessNotifyViewName
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmAccessStorageType
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmAccessStatus
        MIN-ACCESS    read-only
        DESCRIPTION  "Create/delete/modify access to the
                      vacmAccessTable is not required.
                     "

        OBJECT        vacmViewTreeFamilyMask
        WRITE-SYNTAX  OCTET STRING (SIZE (0))
        MIN-ACCESS    read-only
        DESCRIPTION  "Support for configuration via SNMP of subtree
                      families using wild-cards is not required.
                     "

        OBJECT        vacmViewTreeFamilyType
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmViewTreeFamilyStorageType
        MIN-ACCESS    read-only
        DESCRIPTION  "Write access is not required."

        OBJECT        vacmViewTreeFamilyStatus
        MIN-ACCESS    read-only
        DESCRIPTION  "Create/delete/modify access to the
                      vacmViewTreeFamilyTable is not required.
                     "
    ::= { vacmMIBCompliances 1 }

-- Units of conformance **********************************************

vacmBasicGroup OBJECT-GROUP
    OBJECTS {
              vacmContextName,
              vacmGroupName,
              vacmSecurityToGroupStorageType,
              vacmSecurityToGroupStatus,
              vacmAccessContextMatch,
              vacmAccessReadViewName,
              vacmAccessWriteViewName,
              vacmAccessNotifyViewName,
              vacmAccessStorageType,
              vacmAccessStatus,
              vacmViewSpinLock,
              vacmViewTreeFamilyMask,
              vacmViewTreeFamilyType,
              vacmViewTreeFamilyStorageType,
              vacmViewTreeFamilyStatus
            }
    STATUS       current
    DESCRIPTION "A collection of objects providing for remote
                 configuration of an SNMP engine which implements
                 the SNMP View-based Access Control Model.
                "
    ::= { vacmMIBGroups 1 }

END