diff --git a/CHANGELOG.md b/CHANGELOG.md
index 50a3f6b4a..c65096d13 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,12 @@ In addition to original Keep-a-Changelog, we use following rules:
   - This will be checked by GitHub Actions
 - Each Pull Request MAY correspond to one or more lines in this file
 
+## Unreleased
+
+### Fixed
+
+- Fixes to support parsing of ISO13399 database plib. https://github.com/ricosjp/ruststep/pull/251
+
 ## 0.4.0 - 2024-09-20
 
 ### Added
diff --git a/ruststep/src/parser/exchange/parameter.rs b/ruststep/src/parser/exchange/parameter.rs
index d374ffd3d..04d57f6be 100644
--- a/ruststep/src/parser/exchange/parameter.rs
+++ b/ruststep/src/parser/exchange/parameter.rs
@@ -6,8 +6,8 @@ use nom::{branch::alt, combinator::value, Parser};
 
 /// list = `(` \[ [parameter] { `,` [parameter] } \] `)` .
 pub fn list(input: &str) -> ParseResult<Parameter> {
-    tuple_((char_('('), comma_separated(parameter), char_(')')))
-        .map(|(_open, params, _close)| Parameter::List(params))
+    tuple_((char_('('), opt_(comma_separated(parameter)), char_(')')))
+        .map(|(_open, params, _close)| Parameter::List(params.unwrap_or_default()))
         .parse(input)
 }
 
@@ -66,4 +66,25 @@ mod tests {
         assert_eq!(res, "");
         assert_eq!(record, Parameter::real(2.0));
     }
+
+    #[test]
+    fn parameter_list() {
+        let (res, record) = super::untyped_parameter("(1, 2, 3)").finish().unwrap();
+        assert_eq!(res, "");
+        assert_eq!(
+            record,
+            Parameter::List(vec![
+                Parameter::Integer(1),
+                Parameter::Integer(2),
+                Parameter::Integer(3),
+            ])
+        );
+    }
+
+    #[test]
+    fn empty_parameter_list() {
+        let (res, record) = super::untyped_parameter("()").finish().unwrap();
+        assert_eq!(res, "");
+        assert_eq!(record, Parameter::List(vec![]));
+    }
 }
diff --git a/ruststep/src/parser/token.rs b/ruststep/src/parser/token.rs
index 005af3ecb..f886e3aeb 100644
--- a/ruststep/src/parser/token.rs
+++ b/ruststep/src/parser/token.rs
@@ -4,6 +4,8 @@ use crate::{
     ast::*,
     parser::{basic::*, combinator::*},
 };
+use nom::bytes::complete::tag;
+use nom::combinator::map;
 use nom::{
     branch::alt,
     character::complete::{char, digit0, digit1, multispace0, none_of, satisfy},
@@ -68,7 +70,12 @@ pub fn real(input: &str) -> ParseResult<f64> {
 
 /// string = `'` { [special] | [digit] | [space] | [lower] | [upper] | high_codepoint | [apostrophe] [apostrophe] | [reverse_solidus] [reverse_solidus] | control_directive } `'` .
 pub fn string(input: &str) -> ParseResult<String> {
-    tuple((char('\''), many0(none_of("'")), char('\'')))
+    let escaped_char = map(tag("''"), |_| '\''); // Parse '' as a single '
+    let normal_char = none_of("'"); // Parse any character except '
+
+    let string_content = many0(escaped_char.or(normal_char.map(|c| c)));
+
+    tuple((char('\''), string_content, char('\'')))
         .map(|(_start, s, _end)| s.iter().collect())
         .parse(input)
 }
@@ -259,6 +266,13 @@ mod tests {
         assert_eq!(s, "vim");
     }
 
+    #[test]
+    fn escaped_string() {
+        let (res, s) = super::string("'vim''s'").finish().unwrap();
+        assert_eq!(res, "");
+        assert_eq!(s, "vim's");
+    }
+
     #[test]
     fn instance_name() {
         let (res, s) = super::entity_instance_name("#18446744073709551615" /* u64::MAX */)