The ATTRVAL structure defines a concrete type for the value of a single attribute.
typedef struct {
[range(0,26214400)] ULONG valLen;
[size_is(valLen)] UCHAR* pVal;
} ATTRVAL;
valLen: The size, in bytes, of the pVal array.
pVal: The value of the attribute. The encoding of the attribute varies by syntax, as described in the following sections.