example from uniprot

examples/from_uniprot/main.rs

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+use pregel_rs::graph_frame::GraphFrame;
+use pschema_rs::backends::ntriples::NTriples;
+use pschema_rs::backends::parquet::Parquet;
+use pschema_rs::backends::Backend;
+use pschema_rs::pschema::PSchema;
+use pschema_rs::shape::shex::{ShapeAnd, ShapeReference, TripleConstraint};
+
+fn main() -> Result<(), String> {
+    // Define validation rules
+    let start = ShapeAnd::new(
+        "protein",
+        vec![
+            TripleConstraint::new(
+                "IsProtein",
+                "<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>",
+                "<http://purl.uniprot.org/core/Protein>",
+            )
+            .into(),
+            ShapeReference::new(
+                "annotation",
+                "<http://purl.uniprot.org/core/annotation>",
+                TripleConstraint::new(
+                    "IsGlycosylation",
+                    "<http://www.w3.org/1999/02/22-rdf-syntax-ns#type>",
+                    "<http://purl.uniprot.org/core/Glycosylation_Annotation>",
+                )
+                .into(),
+            )
+            .into(),
+        ],
+    )
+    .into();
+
+    // Load Wikidata entities
+    let edges = NTriples::import("./examples/from_uniprot/uniprotkb_reviewed_viruses_10239.nt")?;
+
+    // Perform schema validation
+    match GraphFrame::from_edges(edges) {
+        Ok(graph) => match PSchema::new(start).validate(graph) {
+            Ok(subset) => Parquet::export("uniprotkb_reviewed_viruses_10239.parquet", subset),
+            Err(error) => Err(error.to_string()),
+        },
+        Err(error) => Err(format!("Cannot create a GraphFrame: {}", error)),
+    }
+}