In order to avoid deductions in day-to-day operations, the two official trees based on international taxonomies are presented to structure Levels 1 and 2 of the Core Domains.

Tree A: Universal Corporate Taxonomy (APQC PCF Based)
Recommended for traditional management flows, linear operations, physical logistics, and heavy administrative environments. It faithfully covers the 13 process categories of the APQC Cross-Industry Framework.
It is possible that in some branches they can be interpreted as processes, views, etc.; it is always necessary to refer to the decision flow to determine where they belong. Any of these branches could contain a core domain, but also a process, view, etc. In those cases, the branch is added to processes, views, etc., to keep each service in its category.
They are not deleted so as not to give the impression that they are missing by mistake.

/api/strategy (Cat. 1: Develop Vision and Strategy)
/corporate-objectives
/strategic-planning
/macro-indicators

/api/products (Cat. 2: Develop and Manage Products and Services)
/products
/rates
/lifecycle (Version management, launch, and retirement)

/api/commercial (Cat. 3: Market and Sell Products and Services)
/prospects
/opportunities
/commercial-agreements
/campaigns

/api/supply-chain (Cat. 4: Deliver Services / Manage Supply Chain)
/purchase-orders
/inventories
/warehouses
/shipments
/suppliers (Supplier relationship and performance management)

/api/customer-service (Cat. 5: Manage Customer Service)
/service-requests
/returns
/satisfaction

/api/human-capital (Cat. 6: Develop and Manage Human Capital)
/employees
/employment-contracts
/payroll
/performance
/training

/api/technology (Cat. 7: Manage Information Technology)
/it-assets
/it-services
/information-security

/api/finance (Cat. 8: Manage Financial Resources)
/current-accounts
/journal-entries
/tax-receipts
/cash-flows
/budgets

/api/assets (Cat. 9: Acquire, Construct, and Manage Assets)
/real-estate
/machinery-and-equipment
/maintenance

/api/legal-compliance (Cat. 10: Manage Enterprise Risk, Compliance, Remediation, and Resiliency)
/regulatory-audits
/sworn-declarations
/legal-contracts
/risk-management
/business-continuity

/api/external-relations (Cat. 11: Manage External Relationships)
/institutional-relations
/social-responsibility

/api/capabilities (Cat. 12: Develop and Manage Business Capabilities)
/enterprise-architecture
/project-management (PMO)

/api/knowledge (Cat. 13: Develop and Manage Knowledge, Improvement, and Change)
/change-management
/continuous-improvement
/documentation

Tree B: Service Lifecycle Architecture (TM Forum / eTOM Engineering)
Recommended for subscription-based models, intangible assets, SaaS platforms, automated provisioning, and logical infrastructure. It focuses exclusively on the distinctive core of eTOM (FAB, Party, Service, and Resource), avoiding overlaps with the generic corporate management of Tree A.

/api/parties (Party Management: Unified domain distinguishing roles)
/customers (Entity that contracts and pays)
/users (Entity that consumes the service, e.g., employee of a B2B customer)
/partners (B2B2X Partners)
/slas (Contractual SLAs linked to the party)

/api/services (Service Management: Intermediate layer between Customer and Resource)
/service-catalog (Commercial and technical definition of what is sold)
/service-inventory (Active and assigned service instances)
/configurations (Specific parameters for each instance)

/api/fulfillment (Fulfillment: Complete delivery flow)
/service-orders (Order lifecycle: create, validate, decompose)
/qualification (Service Qualification: validate technical feasibility before selling)
/provisioning (Logical activation and resource deployment)

/api/assurance (Assurance: Proactive/reactive operation and support)
/incidents (Reported fault management)
/alarms (Proactive events detected from the network/platform)
/telemetry (Real-time quality metrics)
/sla-management (Monitoring and penalty for non-compliance)
/problems (Root cause management of recurring incidents)

/api/billing (Billing / Revenue Management)
/rating (Rating: calculation of cost based on real-time usage)
/billing-cycles (Generation of recurring invoices)
/reconciliation (Cross-check of usage data vs. billed data)
/collections (Handling of delinquency and disputes)

/api/resources (Resource Management: Logical/network inventory, isolated from corporate IT)
/network-inventory (Logical/physical network topology and elements)
/ip-addresses
/licenses
/server-instances
/capacity (Threshold and availability management before exhaustion)