Additional Digital Object Identifiers (DOIs) have been created for Unidata technologies. We
encourage you to use the DOIs when citing or otherwise referring to these technologies, because
they provide a mechanism by which the information referred to can be found even if
the web address underlying the DOI changes over time.
DOIs are strings of characters assigned by a registering organization to uniquely idenfity
a digital resource such as a document, software package, data set, or other electronic “object.”
Once a DOI is registered, metadata about the object can be associated
with the identifier and maintained separately from the object itself, so
that changes to the object's location can be reflected in the DOI's metadata.