There is only one item in the ENTRY category, _entry.id. This
data item gives a name to this entry and is indirectly a key to
the categories (such as CELL, GEOM, EXPTL) that describe
information pertinent to the entire data block.
Example 1 - based on PDB entry 5HVP and laboratory records for the
structure corresponding to PDB entry 5HVP.
Example 2 - based on data set TOZ of Willis, Beckwith & Tozer
[Acta Cryst. (1991), C47, 2276-2277].
Key Category Items
Items in Category entry