# Architecture of Semantica for Context and Accountable AI: A Knowledge-Graph-First Design

> Explore Semantica's knowledge-graph-first architecture for accountable AI. Discover how its layered pipeline delivers traceable, auditable AI decisions with semantic entity extraction and provenance.

- Repository: [Semantica /semantica](https://github.com/semantica-agi/semantica)
- Tags: architecture
- Published: 2026-09-12

---

**Semantica implements a layered, knowledge-graph-first pipeline that ingests raw data, extracts semantic entities, and overlays a Context Graph with W3C PROV-O provenance to deliver fully traceable, auditable AI decisions.**

The `semantica-agi/semantica` repository delivers an open-source framework engineered to eliminate the black-box problem in artificial intelligence. The **architecture of Semantica for context and accountable AI** centers on a **Knowledge Graph (KG)** pipeline that transforms unstructured data into structured semantics, then layers context management, provenance tracking, and decision governance on top to create systems where every inference is explainable and reproducible.

## Core Architectural Layers

Semantica organizes functionality into distinct pipeline layers, each implemented as dedicated packages within the repository.

### Ingestion and Parsing

According to the Semantica source code, the pipeline begins in the `semantica.ingest` and `semantica.parse` packages, which collect data from files, web sources, databases, streams, and cloud storage. The `semantica.normalize` and `semantica.split` modules standardize this raw content into consistent formats suitable for semantic processing.

### Semantic Extraction and Conflict Resolution

The `semantica.semantic_extract` package detects entities, relations, and events. Before final graph assembly, the `semantica.conflicts` and `semantica.deduplication` packages resolve contradictory facts and remove duplicates to ensure data integrity within the knowledge base.

### Knowledge Graph Construction

The `semantica.kg` module assembles nodes, edges, and temporal facts into the core Knowledge Graph. This layer persists data through `semantica.vector_store` for embeddings and `semantica.graph_store` for graph-native retrieval, enabling high-performance semantic queries.

### Intelligence Layer

As implemented in [`semantica/reasoning/reasoner.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/reasoning/reasoner.py) and supporting modules, the Intelligence Layer comprises four critical components:

- **Ontology Management**: The `semantica.ontology` package defines vocabularies and constraints that govern valid reasoning.
- **Reasoning Engines**: The `semantica.reasoning` module runs **Rete**, **Datalog**, and **SPARQL** engines against the enriched KG.
- **Provenance Tracking**: The `semantica.provenance` package implements W3C PROV-O lineage tracking for all data transformations.
- **Context and Decisions**: The **`semantica.context`** package records decisions, builds the **Context Graph**, and links causal relationships between inferences.

### Export and Services

The `semantica.export` module supports RDF, JSON-LD, and Parquet formats for data portability, while `semantica.visualization` provides graph rendering capabilities. External integration occurs through `semantica.mcp_server` and a comprehensive CLI that exposes pipeline functions as Model Context Protocol tools.

## Context and Accountable AI Implementation

Accountability in Semantica centers on the **Context Graph**, a specialized layer that sits atop the Knowledge Graph to capture decision rationale, causal dependencies, and governance audit trails.

### The Context Graph Structure

Implemented in [`semantica/context/context_graph.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_graph.py), the Context Graph stores immutable decision objects alongside their metadata. Unlike the Knowledge Graph which stores facts, the Context Graph stores *decisions about facts*, creating a dual-layer architecture where raw data and AI reasoning remain distinct but linked.

### Decision Recording and Provenance

The `record_decision()` function creates immutable decision objects capturing **category**, **scenario**, **reasoning logic**, **outcome**, **confidence scores**, and arbitrary metadata. According to the Semantica source code, the [`semantica/context/context_provenance.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_provenance.py) module automatically attaches W3C PROV-O provenance metadata to each decision, recording exactly which data sources and transformations contributed to the conclusion.

### Causal Relationships and Impact Analysis

The `add_causal_relationship()` API enables developers to link decisions through semantic predicates such as *enables* or *blocks*. These edges form traversable chains within the Context Graph, allowing `trace_decision_chain()` to reconstruct full ancestry trees and `analyze_decision_impact()` to map downstream consequences of upstream choices, as defined in [`semantica/context/context_retriever.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_retriever.py).

### Governance and Audit

Before commitment, the `check_decision_rules()` function runs policy engines against the Context Graph to enforce compliance constraints. Upon approval, decisions become immutable and exportable via [`semantica/export/exporter.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/export/exporter.py) in PROV-O, CSV, or JSON formats for regulator-ready audit trails.

## Working with the Context API: Practical Examples

The following example demonstrates how to record a decision, link it causally to downstream processes, query for similar historical decisions, enforce governance rules, and export an audit trail using the public `semantica.context` package.

```python
from semantica.context import ContextGraph

# Initialize the Context Graph

ctx = ContextGraph()

# 1. Record a decision with full provenance

decision_id = ctx.record_decision(
    category="risk_assessment",
    scenario="loan_application",
    reasoning="credit_score>700 && debt_to_income<0.4",
    outcome="approve",
    confidence=0.92,
    metadata={"applicant_id": "A1234"},
)

# 2. Establish causal link to subsequent business process

ctx.add_causal_relationship(
    source_id=decision_id,
    target_category="marketing",
    relationship="enables",
    description="Approved loan opens up cross-sell opportunity"
)

# 3. Retrieve semantically similar precedent decisions

similar = ctx.find_similar_decisions(
    category="risk_assessment",
    query_vector=ctx.embed_text("high credit score, low DTI")
)
print("Top similar decisions:", similar[:3])

# 4. Validate against governance policies before commitment

if ctx.check_decision_rules(decision_id):
    ctx.commit(decision_id)  # Marks immutable

else:
    raise RuntimeError("Policy violation detected")

# 5. Export regulator-ready audit trail

audit_json = ctx.export_audit(decision_id, fmt="prov")
with open("audit_A1234.json", "w") as f:
    f.write(audit_json)

```

All functions above are implemented in [`semantica/context/context_graph.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_graph.py), [`semantica/context/context_provenance.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_provenance.py), and [`semantica/context/context_retriever.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_retriever.py), with additional MCP server wrappers available in [`semantica_mcp/mcp/tools/decisions.py`](https://github.com/semantica-agi/semantica/blob/main/semantica_mcp/mcp/tools/decisions.py).

## Summary

- Semantica uses a **knowledge-graph-first pipeline** that processes raw data through ingestion, semantic extraction, and conflict resolution layers before constructing the core KG in `semantica.kg`.
- The **Context Graph** ([`semantica/context/context_graph.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_graph.py)) provides a dedicated layer for decision recording, causal relationship mapping, and impact analysis, separate from but linked to the factual Knowledge Graph.
- **W3C PROV-O provenance tracking** in [`semantica/context/context_provenance.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_provenance.py) ensures every decision maintains complete lineage metadata for traceability.
- The **Decision Recorder** API creates immutable decision objects with `record_decision()`, while `check_decision_rules()` enforces governance constraints prior to commitment.
- **Audit trails** can be exported in multiple formats (PROV-O, JSON, CSV) via [`semantica/export/exporter.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/export/exporter.py) for regulatory compliance and external verification.

## Frequently Asked Questions

### How does Semantica track the provenance of AI decisions?

Semantica implements W3C PROV-O standards through the [`semantica/context/context_provenance.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_provenance.py) module. When `record_decision()` is called, the system automatically captures lineage metadata linking the decision to its source data, transformation steps, and reasoning logic. This provenance data is queryable and exportable in standardized formats for verification and regulatory audits.

### What reasoning engines does Semantica support?

The [`semantica/reasoning/reasoner.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/reasoning/reasoner.py) module integrates multiple inference engines including **Rete** for rule-based reasoning, **Datalog** for logical deduction, and **SPARQL** for graph pattern matching. These engines operate on the enriched Knowledge Graph to derive new facts before decisions are recorded in the Context Graph.

### How does the Context Graph differ from the Knowledge Graph?

The **Knowledge Graph** (managed in `semantica/kg/`) stores factual entities and relationships extracted from raw data. The **Context Graph** (managed in [`semantica/context/context_graph.py`](https://github.com/semantica-agi/semantica/blob/main/semantica/context/context_graph.py)) stores interpretive layers including decisions, confidence scores, causal links, and governance outcomes. This separation maintains clean data semantics while enabling full accountability for AI inferences.

### Can Semantica integrate with existing MCP servers?

Yes, the repository includes [`semantica_mcp/mcp/tools/decisions.py`](https://github.com/semantica-agi/semantica/blob/main/semantica_mcp/mcp/tools/decisions.py), which exposes the decision-recording API as **Model Context Protocol (MCP)** tools. This allows external AI systems and agents to record decisions, query similar precedents, and check governance rules through standardized MCP server interfaces without requiring direct library integration.