Home - Apache Ossie (incubating) Apache Ossie (incubating) Home About Community Ecosystem Updates GitHub ASF Foundation License Events Sponsorship Privacy Security Thanks Home About Community Ecosystem Updates GitHub Apache Ossie (incubating) is the universal standard for semantic data Apache Ossie (incubating) is an industry-wide specification effort to standardize how we exchange semantic metadata across analytics, AI and BI platforms, providing a vendor neutral, single source of truth for semantic data. Ossie was previously known as Open Semantic Interchange (OSI). View Specification Get Involved 100% Vendor Neutral YAML Configuration Apache 2.0 Open Source AI Ready Semantic Context Write Once, Query Anywhere. Stop redefining "Revenue" in every dashboard. Apache Ossie uses a declarative YAML standard to define metrics, dimensions, and joins — so every tool and agent in your stack works from the same source of truth. Consistent Definitions Ensure Marketing, Finance, and Sales all see the same numbers — no more metric drift. AI-Ready Context Give LLMs the semantic context they need to answer business questions accurately. No Lock-In Move your business logic between platforms freely. Your metrics belong to you. sales_analytics.ossie.yaml semantic_model: - name: ecommerce_analytics description: Sales and customer analytics ai_context: instructions: "Use for sales analysis" datasets: - name: orders source: sales.public.orders primary_key: [order_id] fields: - name: order_date dimension: is_time: true metrics: - name: total_revenue expression: dialects: - dialect: ANSI_SQL expression: SUM(orders.amount) About Apache Ossie Apache Ossie is a collaborative, open-source effort dedicated to standardizing and streamlining semantic model definitions across the data analytics, AI, and BI ecosystem. Interoperability Seamlessly exchange semantic models between AI agents, BI platforms, and analytics tools. Consistency Maintain consistent data definitions and values across every platform in your ecosystem. Vendor-Agnostic A common standard that works across all vendors, eliminating tool-specific inconsistencies and lock-in. Efficiency Reduce engineering debt and accelerate innovation by using a unified, governed semantic foundation. The Challenge Semantic Fragmentation × Metric Drift Inconsistent KPIs across different dashboards. × Manual Translation Costly, error-prone reconciliation efforts. × Hallucinations Unreliable AI grounding from conflicting data logic. × Integration Debt Complex N-to-N custom integrations between proprietary tools. The Solution A Unified Standard Single Source of Truth Unified semantic and metric definitions. Native Interoperability Direct exchange between platforms and AI agents. Trusted AI Grounding Agents reasoning accurately based on business logic. Reduced TCO Lower costs through automated model exchange. Core Classes The Apache Ossie specification defines these building blocks: Semantic Model Top-level container representing a complete model with datasets, relationships, and metrics. Datasets Logical business entities — fact and dimension tables with fields and structure. Fields Row-level attributes for grouping, filtering, and metric expressions. Metrics Aggregate calculations — sums, averages, ratios — spanning multiple datasets. Dimensions Categorical attributes: Where, When, Who. Relationships Foreign key constraints connecting datasets, supporting simple and composite keys. Latest Updates News and announcements from the Apache Ossie community July 10, 2026 Apache Ossie (Incubating): The New Name for Open Semantic Interchange The Open Semantic Interchange project has been accepted into the Apache Incubator under a new name — Apache Ossie (incubating). The spec, the community, and the mission haven't changed, but the name, governance home, and long-term trajectory have. June 4, 2026 The FSI Semantic Working Group Is Live The Financial Services Semantic Working Group has held its first formal meeting, bringing together practitioners from across banking, insurance, asset management, and market infrastructure to solve the industry's semantic alignment challenge. April 28, 2026 OSI Community Update: What's New and What's Next The OSI specification is live, working groups are taking shape, and 14 new participants have joined the initiative. March 24, 2026 Denodo Joins Snowflake to Advance Open Semantic Interchange Denodo joins Snowflake and industry leaders to advance data and AI interoperability through the Open Semantic Interchange. February 10, 2026 Databao Becomes a Partner of the Open Semantic Interchange Initiative JetBrains' Databao becomes a partner of the OSI initiative, contributing its open-source context engine and data agent to the ecosystem. View All Updates › Apache Ossie (incubating) Home About Community Ecosystem Updates GitHub Home a Back to top Copyright © 2026 The Apache Software Foundation, Licensed under the Apache License, Version 2.0. Apache, the names of Apache projects, and the feather logo are either registered trademarks or trademarks of the Apache Software Foundation in the United States and/or other countries. All other marks mentioned may be trademarks or registered trademarks of their respective owners. Apache Ossie is an effort undergoing incubation at The Apache Software Foundation (ASF), sponsored by the Apache Incubator. Incubation is required of all newly accepted projects until a further review indicates that the infrastructure, communications, and decision making process have stabilized in a manner consistent with other successful ASF projects. While incubation status is not necessarily a reflection of the completeness or stability of the code, it does indicate that the project has yet to be fully endorsed by the ASF. Made with Material for MkDocs