General  
 
- Item name
- _spectral_density.id
- Category name
- spectral_density
- Attribute name
- id
- Required in PDB entries
- yes
- Used in current PDB entries
- No
 
 
 
 
Item Description  
 
 
 
Data Type  
 
- Data type code
- int
- Data type detail
-               int item types are the subset of numbers that are the negative 
               or positive integers.
- Primitive data type code
- numb
- Regular expression
- -?[0-9]+