From ffe74fea485b80632155dd6ffc07b041168ef327 Mon Sep 17 00:00:00 2001
From: Simon Clark <52653938+jsimonclark@users.noreply.github.com>
Date: Thu, 8 Aug 2024 15:00:22 +0200
Subject: [PATCH] Update README.md

add SPARQL example
---
 README.md | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/README.md b/README.md
index f9d1456..a4d4c48 100644
--- a/README.md
+++ b/README.md
@@ -116,6 +116,24 @@ This domain ontology supports the creation of Linked Data in any RDF-supported f
     ]
 }
 ```
+This data can be read into an RDF graph and queried using SPARQL. For example, the following SPARQL query retrieves the value and unit for the diameter of the electrode:
+```sparql
+SELECT ?diameterValue ?measurementUnit
+WHERE {
+  ?electrode a <{echo.Electrode.iri}> ;
+             <{echo.hasProperty.iri}> ?property .
+
+  ?property a <{echo.Diameter.iri}> ;
+            <{echo.hasNumericalPart.iri}> ?numericalPart ;
+            <{echo.hasMeasurementUnit.iri}> ?measurementUnit .
+
+  ?numericalPart <{echo.hasNumericalValue.iri}> ?diameterValue .
+}
+```
+and returns the result:
+```
+2 https://w3id.org/emmo#CentiMetre
+```
 ## Reference IRIs
 
 The table below contains a quick cheat sheet of IRIs for accessing different files from the ontology