Data Item _array_structure.compression_type
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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. |