Classification Guides
Curated knowledge for navigating 1,000+ classification systems, 1.3M+ nodes, and 321K+ crosswalk edges.
Getting Started with World Of Taxonomy
API quickstart, MCP setup, authentication, and rate limits for the unified classification knowledge graph.
MCP Setup Guide for Claude Desktop, Cursor, Zed, and other AI clients
Step-by-step setup of the World Of Taxonomy MCP server in Claude Desktop, Cursor, Zed, VS Code Continue, Windsurf, and generic MCP clients. Covers API key generation, per-client config, verification, and troubleshooting.
Systems Catalog - All 1,000+ Classification Systems
Complete catalog of classification systems organized by category: industry, trade, occupation, health, education, financial, regulatory, and domain taxonomies.
Crosswalk Map - How Classification Systems Connect
Topology of 326K+ crosswalk edges linking classification systems. Translation paths, match types, and how to navigate between systems.
Industry Classification Guide - Which System to Use
Decision tree for choosing the right industry classification system by country, purpose, and granularity. Compares NAICS, ISIC, NACE, SIC, and regional systems.
Medical and Health Classification Systems Compared
Comparison of ICD-10-CM, ICD-11, MeSH, LOINC, ATC, SNOMED CT, and other health classification systems with use cases and crosswalk paths.
Trade and Product Classification Guide
How HS, CPC, UNSPSC, SITC, and BEC relate. Code structure, crosswalk paths, and which system to use for trade, procurement, and statistical reporting.
Occupation Classification Systems Compared
SOC vs ISCO vs ESCO vs O*NET compared. Structure, granularity, crosswalk paths, and which occupation system to use by country and purpose.
Categories and Sectors - How Systems Are Organized
The 16 categories and domain sectors that organize 1,000+ classification systems in World Of Taxonomy. Category definitions, system counts, and navigation.
Domain Taxonomies vs Official Standards
How World Of Taxonomy splits classification systems into domain taxonomies (plain-language on-ramps) and official standards (NAICS, ISIC, etc), and how every surface exposes the split.
Data Quality and Provenance
Four-tier provenance framework, source verification, hash auditing, and how to report data quality issues.
Inclusion Policy - Which Systems Belong in World Of Taxonomy
Governing policy for what qualifies as a World Of Taxonomy system: published external sources, stable identifiers, enumerated or hierarchical structure, practical size. Used by contributors and downstream portfolio products to decide whether a vocabulary or taxonomy belongs.
Web Vocabularies - schema.org, SKOS, and Related Type Systems
Type and concept vocabularies used by AI assistants, search engines, and structured-data crawlers. Covers schema.org (926 types) as the primary AEO/SEO anchor, plus SKOS, W3C standards, and IAB content taxonomy.
Regulatory and Compliance Standards - HIPAA, GDPR, NIST, ISO, OSHA, and 116 more
120 regulatory and compliance frameworks: US federal (HIPAA, SOX, OSHA, FDA, NIST), US frameworks (NIST CSF, SOC 2, PCI DSS, US GAAP), EU directives (GDPR, NIS2, DORA, MDR, EU AI Act, CSRD), ISO management standards (9001, 14001, 27001, 22301, 45001, 13485, 42001), and global treaties (Basel III, FATF, ILO, Paris Agreement, IMO MARPOL/SOLAS). Cross-framework overlap guide for compliance teams and GRC tooling.
Financial Systems - BICS, TRBC, ICB, GICS, FIBO, IFRS, CFI, Basel, and 50 more
55+ financial classification systems: industry vendor sector trees (Bloomberg BICS, Refinitiv TRBC, ICB, GICS Bridge, SASB SICS), the FIBO ontology (2,521 OWL classes), accounting standards (US GAAP, IFRS, XBRL), instrument and messaging codes (CFI, SWIFT MT, ISO 20022, corporate actions), banking and prudential regulation (Basel III, EU Taxonomy, SFDR, TNFD), 30 curated finance domain taxonomies, and emerging crypto vocabularies (token standards, DeFi protocols).
Academic and Research Classification - arXiv, MSC, JEL, Dewey, LCC, AACSB, ABET, EQF, SFIA, and more
30 academic and research classification systems: subject taxonomies for preprints (arXiv) and journals (Scopus ASJC, WoS Categories, ERA FoR, ANZSRC FOR/SEO, FORD Frascati, JEL, MSC, PACS, ACM CCS), library classifications (Dewey, UDC, LCC, LCSH, Getty AAT, UNESCO Thesaurus), education accreditation and qualification frameworks (AACSB, ABET, EQF, AQF, NQF UK, NGSS, CCSS, Bloom Taxonomy), and skills/competence frameworks (DigComp, e-CF, SFIA, LinkedIn Skills, WorldSkills).
Environmental Standards and Scales - BREEAM, LEED, IUCN, CITES, GHG Protocol, SDG, TNFD, Beaufort, Köppen, and more
30 environmental classification systems: green-building rating schemes (BREEAM, LEED), biodiversity and conservation taxonomies (IUCN Red List, CITES, Ramsar, CBD targets, UNEP Chemicals), waste and chemicals codes (EPA RCRA, EU Waste Catalogue, Stockholm/Rotterdam/Minamata Conventions), climate and energy data taxonomies (GHG Protocol, IEA Energy Balance, IRENA, FAO AQUASTAT, FAOSTAT, ISO 14001/14040/14064/50001), and natural-science scales (Beaufort, Saffir-Simpson, Fujita, UV Index, Köppen Climate, Geological Timescale, Periodic Table). Plus SDG 2030 and TNFD.
Geographic Classification - ISO 3166, UN M.49, NUTS, FIPS, GeoNames, Köppen
11 geographic classification systems: country codes (ISO 3166-1, UN M.49), subdivision codes (ISO 3166-2, EU NUTS 2021, US FIPS), feature classification (GeoNames Features), airport regional codes (ICAO), climate zones (Köppen), and country development tiers (WB Income Groups, ADB Sector). Distinct from the country-link layer that maps country -> applicable taxonomies.
Clinical Scales and Specialty Codes - APGAR, ASA, BMI, ICD variants, CPT, HCPCS, MS-DRG, RxNorm, NCI Thesaurus, FHIR, and more
Companion to medical-coding.md. 40 supporting clinical classifications: bedside scales (APGAR, ASA, BMI, Bristol Stool, Pain), ICD national variants (ICD-10-CA/GM/AM, ICD-O-3, ICF, ICHI, ICPC-2), procedure and billing codes (CPT, HCPCS L2/L3, NUCC, MS-DRG, G-DRG), drug codes (RxNorm, NDC, EDQM Dosage, WHO Essential Medicines, CDC Vaccine), nursing taxonomies (NANDA-I, NIC, ICN), specialty registries (NCI Thesaurus, OMIM, Orphanet, GMDN, FHIR Resources, DICOM Modality), and quality measures (HEDIS, CMS Star Ratings, CTCAE, GBD Causes, DSM-5).
Process and Activity Frameworks - APQC PCF, SCOR, ITIL 4, COBIT, PMBOK
Pan-industry process classification frameworks: APQC PCF (13 cross-industry categories) plus SCOR for supply chain, ITIL 4 for IT service management, COBIT for IT governance, PMBOK and PRINCE2 for project management, Six Sigma and Lean for improvement methodologies, TOGAF ADM and ArchiMate for enterprise architecture. Includes Level-1 conceptual crosswalks between APQC and SCOR / ITIL / COBIT / PMBOK.
Technology Standards and Miscellaneous Specifications
~80 technology and reference taxonomies that don't fit cleanly into the industry / regulatory / academic / financial buckets but describe stable enumerated value spaces: telecom and networking specs (3GPP, ITU-T, ITU-R, IETF RFC, IEEE), connectivity (Bluetooth, USB, PCI-SIG, JEDEC, SEMI, VESA), web/internet (MIME types, HTTP status, SPDX licenses, WCAG), cybersecurity catalogs (MITRE ATT&CK, CVE types, OWASP Top 10), AI / cloud-native (AI Model Types, Cloud Native), engineering reference (SI Units, Container ISO, NATO Codification, MIL-STD), trade-tariff minor systems (TARIC, ECCN, Schedule B), and regulatory administrative anchors (CFR Titles, USC Titles, GDPR articles).
System Architecture and Data Flows
Architecture diagrams showing system design, data ingestion pipeline, API request flow, MCP session lifecycle, and the four-channel wiki distribution.