3.1.1.2.6 ATTRTYP

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Any OID-valued quantity stored on an object is stored as an ATTRTYP ([MS-DRSR] section 5.14), a 32-bit unsigned integer. The ATTRTYP space is 32 bits wide and is divided into the following ranges.

Range

Description

[0x00000000..0x7FFFFFFF]

ATTRTYPs that map to OIDs via the prefix table.

[0x80000000..0xBFFFFFFF]

ATTRTYPs used as values of msDS-IntId attribute.

[0xC0000000..0xFFFEFFFF]

Reserved for future use.

[0xFFFF0000.. 0xFFFFFFFF]

Reserved for internal use (never appear on the wire).

The mapping from ATTRTYPs A to OID O works as follows:

  • If A in [0x00000000..0x7FFFFFFF], A maps to O via a prefix table as specified in [MS-DRSR] section 5.16.4 (the OidFromAttid procedure).

  • If A in [0x80000000..0xBFFFFFFF], let X be the object such that X!msDS-IntId equals A. If X is an attributeSchema object, O is X!attributeID; otherwise X is an classSchema object, and O is X!governsID.

Given an OID O, the schema object X representing the class or attribute identified by O is the object X such that either X!attributeID equals O or X!governsID equals O.