  Engineered solutions are becoming more complex and multi-disciplinary in
nature. This evolution requires new techniques to enhance design and analysis
tasks that incorporate data integration and interoperability across various
engineering tool suites spanning multiple domains at different abstraction
levels. Semantic Web Technologies (SWT) offer data integration and
interoperability benefits as well as other opportunities to enhance reasoning
across knowledge represented in multiple disparate models. This paper
introduces the Digital Engineering Framework for Integration and
Interoperability (DEFII) for incorporating SWT into engineering design and
analysis tasks. The framework includes three notional interfaces for
interacting with ontology-aligned data. It also introduces a novel Model
Interface Specification Diagram (MISD) that provides a tool-agnostic model
representation enabled by SWT that exposes data stored for use by external
users through standards-based interfaces. Use of the framework results in a
tool-agnostic authoritative source of truth spanning the entire project,
system, or mission.
