Support generalized RDF N-Quads serialization.

Add support for generalized RDF `BlankNode` predicate during N-Quads serialization.
digitalbazaar · Sep 15, 2023 · fb7d15c · fb7d15c
1 parent 71638d8
commit fb7d15c
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -70,6 +70,7 @@
   - Use a pre-computed map of replacement values.
   - Performance difference depends on the number of replacements. The
     [rdf-canon][] escaping test showed up to 15% improvement.
+- Support generalized RDF `BlankNode` predicate during N-Quads serialization.
 
 ### Fixed
 - Disable native lib tests in a browser.

diff --git a/lib/NQuads.js b/lib/NQuads.js
@@ -240,8 +240,12 @@ module.exports = class NQuads {
       nquad += `_:${s.value}`;
     }
 
-    // predicate can only be NamedNode
-    nquad += ` <${_iriEscape(p.value)}> `;
+    // predicate normally a NamedNode, can be a BlankNode in generalized RDF
+    if(p.termType === TYPE_NAMED_NODE) {
+      nquad += ` <${_iriEscape(p.value)}> `;
+    } else {
+      nquad += ` _:${p.value} `;
+    }
 
     // object is NamedNode, BlankNode, or Literal
     if(o.termType === TYPE_NAMED_NODE) {