Carbon Index — Publish, Micro-IFC Sync & Statutory Sign-Off Engine

The Publish & Sync engine provides the governance, data persistence, and OpenBIM interoperability bridge for Carbon Index. It orchestrates the dual-state calculation lifecycle—allowing users to perform exploratory what-if calculations locally in browser storage (IndexedDB) before committing permanent, signed carbon aspects to the Bentley iModel Changeset and exporting standardized Micro-IFC files.

Dual-State Lifecycle Architecture

Publish & Sync Workspace Interface

Publish & Sync Workspace

The Publish & Sync interface is organized into three distinct management panels:

Publishing Readiness Checklist:
- Total Assessable Elements count.
- Material Mapping Resolution completeness ($%$).
- Solid Geometry Take-off coverage ($%$).
- Scope Exclusions verified.
Statutory Sign-Off & Provenance Metadata:
- Assessor Full Name & Organization.
- Professional Registration Number (e.g. RICS, CIBSE, IStructE).
- Assessment Purpose (e.g. BSR Gateway 2 Planning Submission, GLA WLCA Policy SI 2, BREEAM Mat 01 Credit).
- Assessment Lifecycle Scope ($A1–A5$ Upfront, $A–C$ Whole Life, Module $D$).
OpenBIM & Micro-IFC Schema Generation:
- Dynamic schema compilation tools.
- OpenBIM IFC STEP file download.
- JSON Audit Bundle export.

Dynamic ECSchema & Element Aspect Architecture

When publishing to an iModel, Carbon Index dynamically injects the standardized Carbon_Schema XML ECSchema into the repository:

`Carbon_Schema` ECSchema Definition:

Schema Name: Carbon_Schema (version 01.00.00)
Base Schema: Inherits from BisCore.ElementUniqueAspect
Aspect Class: Carbon_Schema:Carbon_Asset_Aspect

Properties Injected onto Physical Elements:

<ECClass typeName="Carbon_Asset_Aspect" isCustomAttributeClass="False">
    <BaseClass>bis:ElementUniqueAspect</BaseClass>
    <ECProperty propertyName="MaterialId" typeName="string" />
    <ECProperty propertyName="MaterialName" typeName="string" />
    <ECProperty propertyName="EpdSource" typeName="string" />
    <ECProperty propertyName="OpenXpdUuid" typeName="string" />
    <ECProperty propertyName="DensityKgM3" typeName="double" />
    <ECProperty propertyName="NetVolumeM3" typeName="double" />
    <ECProperty propertyName="CalculatedMassKg" typeName="double" />
    <ECProperty propertyName="UpfrontCarbonA1A5KgCo2e" typeName="double" />
    <ECProperty propertyName="WholeLifeCarbonAtoCKgCo2e" typeName="double" />
    <ECProperty propertyName="RicsElementCode" typeName="string" />
    <ECProperty propertyName="RicsElementName" typeName="string" />
    <ECProperty propertyName="ReconciliationStatus" typeName="string" />
    <ECProperty propertyName="AssessorSignature" typeName="string" />
    <ECProperty propertyName="PublishTimestamp" typeName="dateTime" />
</ECClass>

OpenBIM Micro-IFC Generation

For external supply chain stakeholders utilizing non-Bentley BIM environments (e.g. Autodesk Revit, Graphisoft Archicad, Solibri Office), Carbon Index compiles a lightweight Micro-IFC:

Micro-IFC Export Workflow

Micro-IFC Technical Highlights:

IFC4 / IFC2x3 Compliant: Uses standard IfcPropertySet containers (Pset_CarbonEmbodiedFootprint, Pset_RICS_WLCA).
Fractional File Size: Contains only element GUID references, material bindings, and lifecycle carbon metrics—avoiding heavy mesh duplication.
Round-Trip Auditability: Enables federated coordination in Navisworks or Solibri with full carbon filtering.