1. a representation of a domain object model according to its information aspect. In other words, it is a model of the information about the concepts in the universe of discourse, relevant to the architecture effort.
2. An ”architectural product” that represents the structure of information- e.g. a logical or physical data model.
1. NATO Architecture Framework (NAF) Chapter 3, NNEC Architecture Elements and Descriptions
2. NATO Architecture Framework (NAF) Chapter 5, NAF Meta Model Glossary
As such, the information model is inherently of a conceptual nature. Information models address the information aspect of the universe of discourse. They are not intended to reflect data storage solutions.