Multiple identifiers

GSL allows you to specify multiple identifiers within a single query, enabling the selection of atoms matching any of the provided criteria.

Residue names:
```
resname POPE POPG
```
Selects all atoms in residues named POPE or POPG.
Residue numbers:
```
resid 13 15 16 17
```
Selects atoms in residues numbered 13, 15, 16, or 17.
Atom names:
```
name P CA HA
```
Selects atoms named P, CA, or HA.
Serial numbers:
```
serial 245 267 269 271
```
Selects atoms with serial numbers 245, 267, 269, or 271.
Chains:
```
chain A B C
```
Selects atoms in chains 'A', 'B', or 'C'.
Element names:
```
elname carbon hydrogen
```
Selects all carbon and hydrogen atoms.
Element symbols:
```
elsymbol C H
```
Selects all carbon and hydrogen atoms.

GSL guide