132 nodes, and the parent of the nine is undefined.

Institutions, funding structures and communication systems that produce, validate and transmit knowledge and credentials, including higher education and research enterprises.

Production, distribution, exchange and accumulation structures through which scarce resources and goods and services are created and allocated across institutional units.

Organisations, people, infrastructures and governance arrangements whose primary intent is to promote, restore or maintain health, including the core system functions that deliver and finance care.

The organised structures of the human organism, from cells to organ systems, and the stable functional organisation those structures enable, including the agreed terminologies that describe them.

Institutionalised rule systems - sources of law, adjudication structures and enforcement mechanisms - that define rights and obligations and create binding decisions backed by legitimate authority.

Formal organisation-of-knowledge structures - ontologies, top-level categories, representation standards and metadata or provenance systems - that define and relate concepts across domains to enable interoperability, retrieval, integration and analysis.

Institutions, authority relations and formal or informal decision structures that determine collective choices and the allocation of public power in a society.

Shared belief and practice complexes organised around sacred or ultimate concerns, including the institutions and community structures that maintain, transmit and regulate those beliefs and practices.

Artefacts, processes and infrastructures that apply organised knowledge to achieve practical objectives, including the standardised technical definitions and system components that enable design, deployment and operation.