diff --git a/src/main/antlr/SparqlLexer.g4 b/src/main/antlr/SparqlLexer.g4
index 75b967818..fdb951589 100644
--- a/src/main/antlr/SparqlLexer.g4
+++ b/src/main/antlr/SparqlLexer.g4
@@ -236,7 +236,7 @@ fragment PN_CHARS
 
 PN_PREFIX: PN_CHARS_BASE ((PN_CHARS | '.')* PN_CHARS)?;
 
-PN_LOCAL: (PN_CHARS_U | ':' | DIGIT | PLX) ((PN_CHARS | '.' | ':' | PLX)* (PN_CHARS | ':' | PLX))?;
+fragment PN_LOCAL: (PN_CHARS_U | ':' | DIGIT | PLX) ((PN_CHARS | '.' | ':' | PLX)* (PN_CHARS | ':' | PLX))?;
 
 fragment PLX: PERCENT | PN_LOCAL_ESC;
 
diff --git a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBgpTest.java b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBgpTest.java
index 9dd6be671..88a2752dd 100644
--- a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBgpTest.java
+++ b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBgpTest.java
@@ -141,6 +141,78 @@ void shouldParseRdfLiteralWithDatatype() {
         assertEquals("xsd:integer", lit.datatype());
     }
 
+    @Test
+    void shouldParsePrefixedNameWithDigitOnlyLocalPart() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                PREFIX ex: <http://example.org/>
+                SELECT * WHERE {
+                  ?s ex:1 ?o .
+                }
+                """);
+
+        BgpAst bgp = (BgpAst) ast.whereClause().patterns().getFirst();
+        TriplePatternAst triple = bgp.triples().getFirst();
+
+        assertInstanceOf(IriAst.class, triple.predicate());
+        assertEquals("ex:1", ((IriAst) triple.predicate()).raw());
+    }
+
+    @Test
+    void shouldParsePrefixedNameWithHyphenInLocalPart() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                PREFIX ex: <http://example.org/>
+                SELECT * WHERE {
+                  ?s ex:abc-def ?o .
+                }
+                """);
+
+        BgpAst bgp = (BgpAst) ast.whereClause().patterns().getFirst();
+        TriplePatternAst triple = bgp.triples().getFirst();
+
+        assertInstanceOf(IriAst.class, triple.predicate());
+        assertEquals("ex:abc-def", ((IriAst) triple.predicate()).raw());
+    }
+
+    @Test
+    void shouldParsePrefixedNameWithEscapedReservedCharacterInLocalPart() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                PREFIX ns: <http://example.org/ns#>
+                SELECT * WHERE {
+                  ?s ns:id\\=123 ?o .
+                }
+                """);
+
+        BgpAst bgp = (BgpAst) ast.whereClause().patterns().getFirst();
+        TriplePatternAst triple = bgp.triples().getFirst();
+
+        assertInstanceOf(IriAst.class, triple.predicate());
+        assertEquals("ns:id\\=123", ((IriAst) triple.predicate()).raw());
+    }
+
+    @Test
+    void shouldParsePrefixedNameWithDefaultPrefix() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                PREFIX : <http://example.org/default#>
+                SELECT * WHERE {
+                  ?s :foo ?o .
+                }
+                """);
+
+        BgpAst bgp = (BgpAst) ast.whereClause().patterns().getFirst();
+        TriplePatternAst triple = bgp.triples().getFirst();
+
+        assertInstanceOf(IriAst.class, triple.predicate());
+        assertEquals(":foo", ((IriAst) triple.predicate()).raw());
+    }
+
     @Test
     void failFastTrueShouldThrowQuerySyntaxExceptionOnInvalidQuery() {
         SparqlParser parser = newParser(true, true);
diff --git a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBindTest.java b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBindTest.java
index e80bd4935..174b72dfd 100644
--- a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBindTest.java
+++ b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserBindTest.java
@@ -2,6 +2,8 @@
 
 import fr.inria.corese.core.next.query.impl.sparql.ast.*;
 import fr.inria.corese.core.next.query.impl.sparql.ast.constraint.FunctionCallAst;
+import fr.inria.corese.core.next.query.impl.sparql.ast.constraint.MultiplyAst;
+import fr.inria.corese.core.next.query.impl.sparql.ast.constraint.SubtractAst;
 import org.junit.jupiter.api.DisplayName;
 import org.junit.jupiter.api.Test;
 
@@ -89,6 +91,41 @@ void shouldParseBindWithArithmetic() {
         assertNotNull(bindAst.expression());
     }
 
+    @Test
+    @DisplayName("BIND(?p*(1-?discount) AS ?price) — arithmetic expression without whitespace around minus")
+    void shouldParseBindWithSubtractWithoutWhitespace() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                SELECT ?price WHERE {
+                  ?x ?p ?discount .
+                  BIND(?p*(1-?discount) AS ?price)
+                }
+                """);
+
+        assertNotNull(ast);
+        GroupGraphPatternAst where = ast.whereClause();
+        assertEquals(2, where.patterns().size());
+
+        PatternAst last = where.patterns().getLast();
+        assertInstanceOf(BindAst.class, last);
+
+        BindAst bindAst = (BindAst) last;
+        assertEquals("price", bindAst.variable().name());
+        assertInstanceOf(MultiplyAst.class, bindAst.expression());
+
+        MultiplyAst multiplyAst = (MultiplyAst) bindAst.expression();
+        assertInstanceOf(VarAst.class, multiplyAst.getLeftArgument());
+        assertEquals("p", ((VarAst) multiplyAst.getLeftArgument()).name());
+        assertInstanceOf(SubtractAst.class, multiplyAst.getRightArgument());
+
+        SubtractAst subtractAst = (SubtractAst) multiplyAst.getRightArgument();
+        assertInstanceOf(LiteralAst.class, subtractAst.getLeftArgument());
+        assertEquals("1", ((LiteralAst) subtractAst.getLeftArgument()).lexical());
+        assertInstanceOf(VarAst.class, subtractAst.getRightArgument());
+        assertEquals("discount", ((VarAst) subtractAst.getRightArgument()).name());
+    }
+
     @Test
     @DisplayName("BIND(\"hello\" AS ?label) — string literal expression")
     void shouldParseBindWithStringLiteral() {
@@ -208,4 +245,4 @@ void shouldAcceptBindVariableInSelectProjection() {
         assertEquals(1, select.projection().variables().size());
         assertEquals("x", select.projection().variables().getFirst().name());
     }
-}
\ No newline at end of file
+}
diff --git a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserFilterTest.java b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserFilterTest.java
index 9d2b1a96f..4e04e478e 100644
--- a/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserFilterTest.java
+++ b/src/test/java/fr/inria/corese/core/next/query/impl/parser/SparqlParserFilterTest.java
@@ -1011,6 +1011,37 @@ void shouldParseAddSubChainEqualsFilter() {
 
     }
 
+    @Test
+    void shouldParseSubtractWithoutWhitespaceInsideParenthesizedMultiplyExpression() {
+        SparqlParser parser = newParserDefault();
+
+        QueryAst ast = parser.parse("""
+                SELECT * WHERE {
+                  ?x ?p ?discount .
+                  ?x ?pricePredicate ?price .
+                  FILTER(?p*(1-?discount) = ?price)
+                }
+                """);
+
+        FilterAst filterAst = (FilterAst) ast.whereClause().patterns().getLast();
+        EqualsAst equalsAst = (EqualsAst) filterAst.operator();
+
+        assertInstanceOf(MultiplyAst.class, equalsAst.getLeftArgument());
+        assertInstanceOf(VarAst.class, equalsAst.getRightArgument());
+        assertEquals("price", ((VarAst) equalsAst.getRightArgument()).name());
+
+        MultiplyAst multiplyAst = (MultiplyAst) equalsAst.getLeftArgument();
+        assertInstanceOf(VarAst.class, multiplyAst.getLeftArgument());
+        assertEquals("p", ((VarAst) multiplyAst.getLeftArgument()).name());
+        assertInstanceOf(SubtractAst.class, multiplyAst.getRightArgument());
+
+        SubtractAst subtractAst = (SubtractAst) multiplyAst.getRightArgument();
+        assertInstanceOf(LiteralAst.class, subtractAst.getLeftArgument());
+        assertEquals("1", ((LiteralAst) subtractAst.getLeftArgument()).lexical());
+        assertInstanceOf(VarAst.class, subtractAst.getRightArgument());
+        assertEquals("discount", ((VarAst) subtractAst.getRightArgument()).name());
+    }
+
     @Test
     void shouldParseUnaryPlusFilter() {
         SparqlParser parser = newParserDefault();