The registrar must keep an index for the purpose of enabling the following matters to be ascertained in relation to any parcel of land—
whether any registered estate relates to the land,
how any registered estate which relates to the land is identified for the purposes of the register,
whether the land is affected by any, and, if so what, caution against first registration, and
such other matters as rules may provide.
Rules may—
make provision about how the index is to be kept and may, in particular, make provision about—
the information to be included in the index,
the form in which information included in the index is to be kept, and
the arrangement of that information;
make provision about official searches of the index.