Add link to EBNF definition

Reviewed-by: Richard Levitte <levitte@openssl.org>
Reviewed-by: Hugo Landau <hlandau@openssl.org>
Reviewed-by: Shane Lontis <shane.lontis@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/20023)

diff --git a/doc/man7/property.pod b/doc/man7/property.pod
index 3d6f269d7ff4715dab1c3298c43546f4272cff8b..bc57a6764814077aabd841823579527a45497880 100644 (file)
--- a/doc/man7/property.pod
+++ b/doc/man7/property.pod
@@ -158,6 +158,9 @@ The lexical syntax in EBNF is given by:
  NumberLiteral  ::= '0' ( [0-7]* | 'x' [0-9A-Fa-f]+ ) | '-'? [1-9] [0-9]+
  PropertyName   ::= [A-Za-z] [A-Za-z0-9_]* ( '.' [A-Za-z] [A-Za-z0-9_]* )*
 
+The flavour of EBNF being used is defined by:
+L<https://www.w3.org/TR/2010/REC-xquery-20101214/#EBNFNotation>.
+
 =head1 HISTORY
 
 Properties were added in OpenSSL 3.0