ajtucker commented on issue #2585:
URL: https://github.com/apache/jena/issues/2585#issuecomment-2233467191

   It looks as though 
[`checkValidLocalname()`](https://github.com/apache/jena/blob/main/jena-arq/src/main/java/org/apache/jena/sparql/util/FmtUtils.java#L474)
 doesn't quite match the production for 
[PN_LOCAL](https://www.w3.org/TR/sparql11-query/#rPN_LOCAL), in that the first 
character of the local name is restricted to: 
   
   > [PN_CHARS_U](https://www.w3.org/TR/sparql11-query/#rPN_CHARS_U) | ':' | 
[0-9] | [PLX](https://www.w3.org/TR/sparql11-query/#rPLX)
   
   while the rest are allowed to be:
   
   > [PN_CHARS](https://www.w3.org/TR/sparql11-query/#rPN_CHARS) | '.' | ':' | 
[PLX](https://www.w3.org/TR/sparql11-query/#rPLX))* 
([PN_CHARS](https://www.w3.org/TR/sparql11-query/#rPN_CHARS) | ':' | 
[PLX](https://www.w3.org/TR/sparql11-query/#rPLX)
   
   Adding the following test fails:
   
   ```diff
   diff --git 
a/jena-arq/src/test/java/org/apache/jena/sparql/syntax/TestSerialization.java 
b/jena-arq/src/test/java/org/apache/jena/sparql/syntax/TestSerialization.java
   index 08c3fd708f..6efb1eaef4 100644
   --- 
a/jena-arq/src/test/java/org/apache/jena/sparql/syntax/TestSerialization.java
   +++ 
b/jena-arq/src/test/java/org/apache/jena/sparql/syntax/TestSerialization.java
   @@ -118,6 +118,9 @@ public class TestSerialization
        @Test public void test_PName_Bad_7()
        { fmtURI_Prefix("http://example/x.";, "<http://example/x.>", pmap1) ; }
    
   +    @Test public void test_PName_Bad_8()
   +    { fmtURI_Prefix("http://default/-x";, "<http://default/-x>", pmap1) ; }
   +
        // Dots
        @Test public void test_Dots_1() // Internal DOT
        { fmtURI_Prefix("http://example/x#a.b";, "ex:a.b", pmap1) ; }
   ```


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