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INTERSECT Scientific Data Layer (SDL)

Connecting scientific data with meaning – A flexible and semantic ecosystem for modern science.

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sosa:ObservableProperty

#SOSA#RDF Class#Observable Property#Entity Detai

The class sosa:ObservableProperty is a core concept from the SOSA/SSN ontology. It represents a quality, characteristic, or measurable feature of a phenomenon, system, or feature of interest.

Definition

IRI: http://www.w3.org/ns/sosa/ObservableProperty

An ObservableProperty represents what is being observed. It can refer to physical, chemical, biological, or conceptual characteristics. It is typically linked to sosa:Observation through the property sosa:observedProperty.

Usage in SDL

In the Scientific Data Layer (SDL), sosa:ObservableProperty is used to describe:

  • The measurable aspects of samples (e.g., phase composition, purity)
  • Output targets of procedures and instruments (e.g., temperature, mass loss)
  • Features of interest captured during workflows

Each observable property should be semantically described and, where applicable, typed with appropriate units and value types.

Customization by Deployment

SDL supports deployment-specific customization of observable properties:

  • Each SDL deployment may define its own set of custom observable properties, tailored to local experimental needs, instruments, and workflows.
  • These custom properties may coexist alongside shared/common terms defined in shared namespaces (e.g., acl:, sdl:).
  • Data types (e.g., numeric, string, URI) and associated file representations (e.g., .xye, .csv, .txt, .json) may also be customized per deployment.
  • Catalog entries, shapes, and UI views can adapt based on the declared observable property types.

This flexibility allows the SDL platform to maintain semantic interoperability while also accommodating local specialization and evolution of measurements.

Example

acl:phaseComposition a sosa:ObservableProperty ;
  rdfs:label "Phase Composition" ;
  dct:description "Crystal phase derived from XRD analysis." .

acl:xrdObs123 a sosa:Observation ;
  sosa:observedProperty acl:phaseComposition ;
  sosa:hasResult [ rdf:value "Orthorhombic perovskite" ] .
Predicate Description
sosa:observedProperty Connects an Observation to an ObservableProperty
sosa:hasFeatureOfInterest Links observation to entity being measured (sample, etc.)
qudt:unit or schema:unitText Used to indicate units for numeric results

Best Practices

  • Provide rdfs:label and dct:description
  • Use qudt:unit or similar vocabularies for measurable quantities
  • Align with controlled vocabularies when available (e.g., ENVO, CHEBI)
  • Reuse properties across platforms where applicable
  • Clearly document locally defined properties, units, and formats to support federation

Let me know if you'd like to auto-generate a vocabulary file for your custom observable properties.

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