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The Dictionary specification defines the concept of a CPE dictionary, which is a repository of CPE names and metadata, with each name identifying a single class of IT product. The Dictionary specification defines processes for using the dictionary, such as how to search for a particular CPE name or look for dictionary entries that belong to a broader product class. Also, the Dictionary specification outlines all the rules that dictionary maintainers must follow when creating new dictionary entries and updating existing entries.
XML Schema Files: [what is a schema?]
CPE 2.3 Dictionary (XSD 1.0)
CPE 2.3 Dictionary Extension (XSD 1.0)