Data Item _axis.system
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General 
- Item name
- _axis.system
- Category name
- axis
- Attribute name
- system
- Required in PDB entries
- no
- Used in current PDB entries
- No
Item Description
The value of _axis.system specifies the coordinate
system used to define the axis: 'laboratory', 'McStas', 'direct',
'orthogonal', 'reciprocal' or 'abstract'.
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
- laboratory
Controlled Vocabulary
| Allowed Value | Details |
|---|---|
| McStas | the axis is referenced to the NeXus/HDF5 McStas laboratory Cartesian coordinate system |
| abstract | the axis is referenced to an abstract Cartesian coordinate system |
| direct | the axis is referenced to the direct lattice |
| laboratory | the axis is referenced to the imgCIF standard laboratory Cartesian coordinate system |
| orthogonal | the axis is referenced to the cell Cartesian orthogonal coordinates |
| reciprocal | the axis is referenced to the reciprocal lattice |
Controlled Vocabulary at Deposition
| Allowed Value | Details |
|---|---|
| McStas | the axis is referenced to the NeXus/HDF5 McStas laboratory Cartesian coordinate system |
| abstract | the axis is referenced to an abstract Cartesian coordinate system |
| direct | the axis is referenced to the direct lattice |
| laboratory | the axis is referenced to the imgCIF standard laboratory Cartesian coordinate system |
| orthogonal | the axis is referenced to the cell Cartesian orthogonal coordinates |
| reciprocal | the axis is referenced to the reciprocal lattice |