By default array components ('elements' in the non-XML sense) are whitespace-separated. This fails for components with embedded whitespace or missing completely:

        Example:

        In the protein database ' CA' and 'CA' are different atom types, and and array could be:

        <array delimiter="/" dictRef="pdb:atomTypes">/ N/ CA/CA/ N/</array> 

        

Note that the array starts and ends with the delimiter, which must be chosen to avoid accidental use. There is currently no syntax for escaping delimiters.