diff --git a/README.adoc b/README.adoc
index ab71bf9d..8e06bd02 100644
--- a/README.adoc
+++ b/README.adoc
@@ -14,7 +14,7 @@ You will need the `maven` build tool and `make`.
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar xml_file --check-type xsd-niso
+java -jar mnconvert-1.58.0.jar xml_file --check-type xsd-niso
 ----
 
 - `--check-type`, `-ct` - Check against XSD NISO (value xsd-niso), DTD ISO (dtd-iso), DTD NISO (dtd-niso)
@@ -37,7 +37,7 @@ java -jar mnconvert-1.44.0.jar xml_file --validation-against <path DTD or XSD>
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar xml_file [options]
+java -jar mnconvert-1.58.0.jar xml_file [options]
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -52,7 +52,7 @@ java -jar mnconvert-1.57.0.jar xml_file [options]
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar xml_file [options]
+java -jar mnconvert-1.58.0.jar xml_file [options]
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -67,7 +67,7 @@ java -jar mnconvert-1.57.0.jar xml_file [options]
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar xml_file [options]
+java -jar mnconvert-1.58.0.jar xml_file [options]
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -78,7 +78,7 @@ java -jar mnconvert-1.57.0.jar xml_file [options]
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar docx_file [options]
+java -jar mnconvert-1.58.0.jar docx_file [options]
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -88,7 +88,7 @@ java -jar mnconvert-1.57.0.jar docx_file [options]
 === 6. Convert from IEEE STL XML to Metanorma AsciiDoc.
 
 ----
-java -jar mnconvert-1.57.0.jar xml_file [options]
+java -jar mnconvert-1.58.0.jar xml_file [options]
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -100,7 +100,7 @@ java -jar mnconvert-1.57.0.jar xml_file [options]
 
 [source,sh]
 ----
-java -jar mnconvert-1.57.0.jar xml_file --output-format ieee --validation-against <path to IEEE DTD>
+java -jar mnconvert-1.58.0.jar xml_file --output-format ieee --validation-against <path to IEEE DTD>
 ----
 
 - `--xsl-file`, `-s` - path to XSL file, optional
@@ -118,7 +118,7 @@ e.g.
 
 [source,sh]
 ----
-java -jar target/mnconvert-1.57.0.jar tests/iso-tc154-8601-1-en.xml --output tests/iso-tc154-8601-1-en.out.xml
+java -jar target/mnconvert-1.58.0.jar tests/iso-tc154-8601-1-en.xml --output tests/iso-tc154-8601-1-en.out.xml
 ----
 
 NOTE: Input XML format (Metanorma, STS ISO/NISO, IEEE or XML2RFC) determines programmatically by root element of input file: +
@@ -151,7 +151,7 @@ Update version in `pom.xml`, e.g.:
 ----
 <groupId>org.metanorma</groupId>
 <artifactId>mnconvert</artifactId>
-<version>1.57.0</version>
+<version>1.58.0</version>
 <name>Metanorma XML to NISO STS XML two-directional converter</name>
 ----
 
@@ -162,8 +162,8 @@ Tag the same version in Git:
 
 [source,xml]
 ----
-git tag v1.57.0
-git push origin v1.57.0
+git tag v1.58.0
+git push origin v1.58.0
 ----
 
 Then the corresponding GitHub release will be automatically created at:
diff --git a/pom.xml b/pom.xml
index ec0a707c..c55664db 100644
--- a/pom.xml
+++ b/pom.xml
@@ -5,7 +5,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>org.metanorma</groupId>
 	<artifactId>mnconvert</artifactId>
-	<version>1.57.0</version>
+	<version>1.58.0</version>
 	<name>Metanorma XML to NISO STS XML two-directional, IEEE to Metanorma ADOC, Metanorma XML to IEEE XML, and XML2RFC to Metanorma Asciidoc IETF converter</name>
 	<packaging>jar</packaging>
 	<url>https://www.metanorma.org</url>
diff --git a/src/main/resources/mn2sts.xsl b/src/main/resources/mn2sts.xsl
index 42080474..49df766a 100644
--- a/src/main/resources/mn2sts.xsl
+++ b/src/main/resources/mn2sts.xsl
@@ -1225,7 +1225,7 @@
 			
 			<xsl:variable name="value">
 				<xsl:choose>
-					<xsl:when test="letter-symbol">symbol</xsl:when>
+					<xsl:when test="letter-symbol = 'symbol' or letter-symbol = 'formula' or letter-symbol = 'equation'"><xsl:value-of select="letter-symbol"/></xsl:when>
 					<xsl:when test=".//abbreviation-type = 'acronym'">acronym</xsl:when>
 					<xsl:when test=".//expression/@type = 'abbreviation'">abbreviation</xsl:when>
 					<xsl:when test="($metanorma_type = 'IEC' or $metanorma_type = 'ISO' or $metanorma_type = 'BSI') and .//expression/@type = 'full'">fullForm</xsl:when> <!-- or normalize-space(.//expression/@type) = '') -->
diff --git a/src/main/resources/mn2xml.xsl b/src/main/resources/mn2xml.xsl
index e4f88a8e..974ed8d6 100644
--- a/src/main/resources/mn2xml.xsl
+++ b/src/main/resources/mn2xml.xsl
@@ -2143,6 +2143,7 @@
 																contributor/organization/subdivision |
 																contributor/organization/identifier |
 																contributor/role/text() |
+																contributor/role/description |
 																ext/structuredidentifier/project-number |
 																language |
 																script |
diff --git a/src/main/resources/sts2mn.adoc.xsl b/src/main/resources/sts2mn.adoc.xsl
index e5aeb2d1..9f3ae922 100644
--- a/src/main/resources/sts2mn.adoc.xsl
+++ b/src/main/resources/sts2mn.adoc.xsl
@@ -2535,7 +2535,13 @@
 				<xsl:text>abbreviation-type:: </xsl:text><xsl:value-of select="@value"/>
 			</xsl:when>
 			<xsl:when test="@value = 'symbol'">
-				<xsl:text>letter-symbol:: true</xsl:text>
+				<xsl:text>letter-symbol:: symbol</xsl:text>
+			</xsl:when>
+			<xsl:when test="@value = 'formula'">
+				<xsl:text>letter-symbol:: formula</xsl:text>
+			</xsl:when>
+			<xsl:when test="@value = 'equation'">
+				<xsl:text>letter-symbol:: equation</xsl:text>
 			</xsl:when>
 			<xsl:otherwise>
 				<xsl:text>type:: </xsl:text>
@@ -2543,8 +2549,6 @@
 						<xsl:when test="@value = 'fullForm'">
 							<xsl:text>full</xsl:text>
 						</xsl:when>
-						<!-- <xsl:when test="@value = 'formula'">
-						<xsl:when test="@value = 'equation'"> -->
 						<xsl:when test="@value = 'variant'">full</xsl:when>
 						<xsl:otherwise><xsl:value-of select="@value"/></xsl:otherwise> <!-- Example: abbreviation -->
 					</xsl:choose>