Data Item _array_structure.compression_type

General

Item name
_array_structure.compression_type
Category name
array_structure
Attribute name
compression_type
Required in PDB entries
no
Used in currrent PDB entries
No

Item Description

Type of data-compression method used to compress the array data.

Data Type

Data type code
ucode
Data type detail
code item types/single words (case insensitive) ...
Primitive data type code
uchar
Regular expression
[_,.;:"&<>()/\{}'`~!@#$%A-Za-z0-9*|+-]*
Default value
none

Controlled Vocabulary

Allowed Value Details
byte_offset Using the 'byte_offset' compression scheme as per A. Hammersley
and the CBFlib manual, section 3.3.3
canonical Using the 'canonical' compression scheme (International Tables
for Crystallography Volume G, Section 5.6.3.1) and CBFlib
manual section 3.3.1
nibble_offset Using the 'nibble_offset' compression scheme as per H. Bernstein
and the CBFlib manual, section 3.3.4
none Data are stored in normal format as defined by
_array_structure.encoding_type and
_array_structure.byte_order.
packed Using the 'packed' compression scheme, a CCP4-style packing
as per J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.
packed_v2 Using the 'packed' compression scheme, version 2, as per
J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.

Controlled Vocabulary at Deposition

Allowed Value Details
byte_offset Using the 'byte_offset' compression scheme as per A. Hammersley
and the CBFlib manual, section 3.3.3
canonical Using the 'canonical' compression scheme (International Tables
for Crystallography Volume G, Section 5.6.3.1) and CBFlib
manual section 3.3.1
nibble_offset Using the 'nibble_offset' compression scheme as per H. Bernstein
and the CBFlib manual, section 3.3.4
none Data are stored in normal format as defined by
_array_structure.encoding_type and
_array_structure.byte_order.
packed Using the 'packed' compression scheme, a CCP4-style packing
as per J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.
packed_v2 Using the 'packed' compression scheme, version 2, as per
J. P. Abrahams pack_c.c and CBFlib manual, section 3.3.2.