...

In order to ensure that no XML element is inadvertently put into the wrong namespace, every IOF ontology MUST NOT declare a default namespace (like such as the one on line 2, above). Expressed another way, every occurrence of “xmlns” MUST be followed by a colon (“:”) and a namespace prefix (such as the ones on lines 3 and 4).

Ontology Namespace Prefix

Every ontology MUST define a short, unique, meaningful, ontology-namespace prefix, like the ones found on lines 2-4such as “iof-se” on line 3, above.

Tools

Every local git repository (i.e., the one on your computer) that pushes changes to the IOF GitHub repository MUST have the EDM Council RDF Toolkit installed, such that every time an RDF/XML file is committed, that file will be automatically rewritten to conform to the policies in this document. The instructions for installing that toolkit can be found at that link.

...