From f4e7673622217dd5608de011054000861b3c0c30 Mon Sep 17 00:00:00 2001
From: Giacomo Citi <giacomo.citi@zazuko.com>
Date: Wed, 17 Apr 2024 13:00:00 +0200
Subject: [PATCH 1/2] include observation sample in fetch-metadata

---
 packages/cube/pipeline/fetch-metadata.ttl     |  6 ++-
 .../pipeline/query-observation-sample.ttl     | 37 +++++++++++++++++++
 2 files changed, 42 insertions(+), 1 deletion(-)
 create mode 100644 packages/cube/pipeline/query-observation-sample.ttl

diff --git a/packages/cube/pipeline/fetch-metadata.ttl b/packages/cube/pipeline/fetch-metadata.ttl
index 20125a3b..6680062b 100644
--- a/packages/cube/pipeline/fetch-metadata.ttl
+++ b/packages/cube/pipeline/fetch-metadata.ttl
@@ -13,6 +13,10 @@
   code:imports <./query-constraint> ;
   code:extension "ttl" ;
 ] .
+[
+  code:imports <./query-observation-sample> ;
+  code:extension "ttl" ;
+] .
 
 _:endpoint a p:Variable ;
   p:name "endpoint" ;
@@ -30,7 +34,7 @@ _:cube a p:Variable ;
     [
       p:stepList
         (
-          [ base:concat\/object (:queryCube :queryConstraint) ]
+          [ base:concat\/object (:queryCube :queryConstraint :queryObservationSample) ]
           [ ntriples:serialize () ]
         )
     ]
diff --git a/packages/cube/pipeline/query-observation-sample.ttl b/packages/cube/pipeline/query-observation-sample.ttl
new file mode 100644
index 00000000..84beaee5
--- /dev/null
+++ b/packages/cube/pipeline/query-observation-sample.ttl
@@ -0,0 +1,37 @@
+@prefix code: <https://code.described.at/> .
+@prefix p: <https://pipeline.described.at/> .
+@prefix sparql: <https://barnard59.zazuko.com/operations/sparql/> .
+@prefix : <http://barnard59.zazuko.com/pipeline/cube-validation/> .
+
+:queryObservationSample a p:Pipeline, p:ReadableObjectMode ;
+  p:steps
+    [
+      p:stepList
+        (
+          [
+            sparql:construct
+              [ code:name "endpoint"; code:value "endpoint"^^p:VariableName ] ,
+              [
+                code:name "query";
+                code:value """
+                PREFIX cube: <https://cube.link/>
+                
+                CONSTRUCT { 
+                  <${cube}> cube:observationSet ?set .
+                  ?set cube:observation ?obs .
+                  ?obs ?p ?o .
+                } 
+                WHERE {
+                  { SELECT ?set ?obs WHERE {
+                      <${cube}> cube:observationSet ?set .
+                      ?set cube:observation ?obs .
+                    } LIMIT 1
+                  }
+                  ?obs ?p ?o
+                }
+                """^^code:EcmaScriptTemplateLiteral
+              ]
+          ]
+        )
+    ]
+  .

From 13a297fcd7d412a15abfb1ac6186b9760a12c750 Mon Sep 17 00:00:00 2001
From: Giacomo Citi <giacomo.citi@zazuko.com>
Date: Wed, 17 Apr 2024 13:18:28 +0200
Subject: [PATCH 2/2] add changeset

---
 .changeset/gold-tables-wink.md | 5 +++++
 1 file changed, 5 insertions(+)
 create mode 100644 .changeset/gold-tables-wink.md

diff --git a/.changeset/gold-tables-wink.md b/.changeset/gold-tables-wink.md
new file mode 100644
index 00000000..c62b13f6
--- /dev/null
+++ b/.changeset/gold-tables-wink.md
@@ -0,0 +1,5 @@
+---
+"barnard59-cube": patch
+---
+
+Include a sample observation in fetch-metadata