diff --git a/src/rp-schematron-base.sch b/src/rp-schematron-base.sch
index 779aba7287..7b98ce8450 100644
--- a/src/rp-schematron-base.sch
+++ b/src/rp-schematron-base.sch
@@ -235,6 +235,14 @@
         <report test="not(@corresp='yes') and (email or xref[@ref-type='corresp'])" 
           role="error" 
           id="author-email-no-corresp">Author <value-of select="e:get-name(name[1])"/> does not have the attribute corresp="yes", but they have a child email element or an xref with the attribute ref-type="corresp".</report>
+        
+        <report test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')" 
+          role="error" 
+          id="author-equal-contrib-1">Author <value-of select="e:get-name(name[1])"/> does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'.</report>
+        
+        <report test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'" 
+          role="error" 
+          id="author-equal-contrib-2">Author <value-of select="e:get-name(name[1])"/> has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'.</report>
      </rule>
     
      <rule context="contrib-group//name" id="name-tests">
diff --git a/src/rp-schematron.sch b/src/rp-schematron.sch
index 780952b2bb..c2b887ffdf 100644
--- a/src/rp-schematron.sch
+++ b/src/rp-schematron.sch
@@ -187,6 +187,10 @@
         <report test="@corresp='yes' and not(email) and not(xref[@ref-type='corresp'])" role="error" id="author-corresp-no-email">[author-corresp-no-email] Author <value-of select="e:get-name(name[1])"/> has the attribute corresp="yes", but they do not have a child email element or an xref with the attribute ref-type="corresp".</report>
         
         <report test="not(@corresp='yes') and (email or xref[@ref-type='corresp'])" role="error" id="author-email-no-corresp">[author-email-no-corresp] Author <value-of select="e:get-name(name[1])"/> does not have the attribute corresp="yes", but they have a child email element or an xref with the attribute ref-type="corresp".</report>
+        
+        <report test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')" role="error" id="author-equal-contrib-1">[author-equal-contrib-1] Author <value-of select="e:get-name(name[1])"/> does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'.</report>
+        
+        <report test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'" role="error" id="author-equal-contrib-2">[author-equal-contrib-2] Author <value-of select="e:get-name(name[1])"/> has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'.</report>
      </rule></pattern><pattern id="name-tests-pattern"><rule context="contrib-group//name" id="name-tests">
     	<assert test="count(surname) = 1" role="error" id="surname-test-1">[surname-test-1] Each name must contain only one surname.</assert>
 	  
diff --git a/src/rp-schematron.xsl b/src/rp-schematron.xsl
index 2461211763..90e1cf17b9 100644
--- a/src/rp-schematron.xsl
+++ b/src/rp-schematron.xsl
@@ -1505,6 +1505,32 @@
                <xsl:text/> does not have the attribute corresp="yes", but they have a child email element or an xref with the attribute ref-type="corresp".</svrl:text>
          </svrl:successful-report>
       </xsl:if>
+      <!--REPORT error-->
+      <xsl:if test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')">
+         <svrl:successful-report xmlns:svrl="http://purl.oclc.org/dsdl/svrl" test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')">
+            <xsl:attribute name="id">author-equal-contrib-1</xsl:attribute>
+            <xsl:attribute name="role">error</xsl:attribute>
+            <xsl:attribute name="location">
+               <xsl:apply-templates select="." mode="schematron-select-full-path"/>
+            </xsl:attribute>
+            <svrl:text>[author-equal-contrib-1] Author <xsl:text/>
+               <xsl:value-of select="e:get-name(name[1])"/>
+               <xsl:text/> does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'.</svrl:text>
+         </svrl:successful-report>
+      </xsl:if>
+      <!--REPORT error-->
+      <xsl:if test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'">
+         <svrl:successful-report xmlns:svrl="http://purl.oclc.org/dsdl/svrl" test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'">
+            <xsl:attribute name="id">author-equal-contrib-2</xsl:attribute>
+            <xsl:attribute name="role">error</xsl:attribute>
+            <xsl:attribute name="location">
+               <xsl:apply-templates select="." mode="schematron-select-full-path"/>
+            </xsl:attribute>
+            <svrl:text>[author-equal-contrib-2] Author <xsl:text/>
+               <xsl:value-of select="e:get-name(name[1])"/>
+               <xsl:text/> has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'.</svrl:text>
+         </svrl:successful-report>
+      </xsl:if>
       <xsl:apply-templates select="*" mode="M22"/>
    </xsl:template>
    <xsl:template match="text()" priority="-1" mode="M22"/>
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-1/author-equal-contrib-1.sch b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/author-equal-contrib-1.sch
new file mode 100644
index 0000000000..4e27aa5224
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/author-equal-contrib-1.sch
@@ -0,0 +1,157 @@
+<schema xmlns="http://purl.oclc.org/dsdl/schematron" xmlns:meca="http://manuscriptexchange.org" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:file="java.io.File" xmlns:java="http://www.java.com/" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xlink="http://www.w3.org/1999/xlink" queryBinding="xslt2">
+  <title>eLife reviewed preprint schematron</title>
+  <ns uri="http://www.niso.org/schemas/ali/1.0/" prefix="ali"/>
+  <ns uri="http://www.w3.org/XML/1998/namespace" prefix="xml"/>
+  <ns uri="http://www.w3.org/1999/xlink" prefix="xlink"/>
+  <ns uri="http://www.w3.org/2001/XInclude" prefix="xi"/>
+  <ns uri="http://www.w3.org/1998/Math/MathML" prefix="mml"/>
+  <ns uri="http://saxon.sf.net/" prefix="saxon"/>
+  <ns uri="http://purl.org/dc/terms/" prefix="dc"/>
+  <ns uri="http://www.w3.org/2001/XMLSchema" prefix="xs"/>
+  <ns uri="https://elifesciences.org/namespace" prefix="e"/>
+  <ns uri="java.io.File" prefix="file"/>
+  <ns uri="http://www.java.com/" prefix="java"/>
+  <ns uri="http://manuscriptexchange.org" prefix="meca"/>
+  <xsl:function name="e:isbn-sum" as="xs:integer">
+    <xsl:param name="s" as="xs:string"/>
+    <xsl:choose>
+      <xsl:when test="string-length($s) = 10">
+        <xsl:variable name="d1" select="number(substring($s,1,1)) * 10"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 9"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1)) * 8"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 7"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1)) * 6"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 5"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1)) * 4"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1)) * 2"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 1"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10) mod 11"/>
+      </xsl:when>
+      <xsl:when test="string-length($s) = 13">
+        <xsl:variable name="d1" select="number(substring($s,1,1))"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 3"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1))"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 3"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1))"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 3"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1))"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1))"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 3"/>
+        <xsl:variable name="d11" select="number(substring($s,11,1))"/>
+        <xsl:variable name="d12" select="number(substring($s,12,1)) * 3"/>
+        <xsl:variable name="d13" select="number(substring($s,13,1))"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10 + $d11 + $d12 + $d13) mod 10"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="number('1')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:is-valid-issn" as="xs:boolean">
+      <xsl:param name="s" as="xs:string"/>
+      <xsl:choose>
+        <xsl:when test="not(matches($s,'^\d{4}\-\d{3}[\dX]$'))">
+          <xsl:value-of select="false()"/>
+        </xsl:when>
+        <xsl:otherwise>
+            <xsl:variable name="d1" select="number(substring($s,1,1)) * 8"/>
+            <xsl:variable name="d2" select="number(substring($s,2,1)) * 7"/>
+            <xsl:variable name="d3" select="number(substring($s,3,1)) * 6"/>
+            <xsl:variable name="d4" select="number(substring($s,4,1)) * 5"/>
+            <xsl:variable name="d5" select="number(substring($s,6,1)) * 4"/>
+            <xsl:variable name="d6" select="number(substring($s,7,1)) * 3"/>
+            <xsl:variable name="d7" select="number(substring($s,8,1)) * 2"/>
+            <xsl:variable name="remainder" select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7) mod 11"/>
+            <xsl:variable name="calc" select="if ($remainder=0) then 0 else (11 - $remainder)"/>
+            <xsl:variable name="check" select="if (substring($s,9,1)='X') then 10 else number(substring($s,9,1))"/>
+            <xsl:value-of select="$calc = $check"/>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:function>
+  <xsl:function name="e:get-name" as="xs:string">
+    <xsl:param name="name"/>
+    <xsl:choose>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="$name/surname[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="'No elements present'"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-copyright-holder">
+    <xsl:param name="contrib-group"/>
+    <xsl:variable name="author-count" select="count($contrib-group/contrib[@contrib-type='author'])"/>
+    <xsl:choose>
+      <xsl:when test="$author-count lt 1"/>
+      <xsl:when test="$author-count = 1">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1]"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/name[1]/surname[1]"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      <xsl:when test="$author-count = 2">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:choose>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab and $contrib-group/contrib[@contrib-type='author'][2]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author']/collab[2]/text()[1])"/>
+              </xsl:when>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+              </xsl:when>
+              <xsl:otherwise>
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/collab[1]/text()[1])"/>
+              </xsl:otherwise>
+            </xsl:choose>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      
+      <xsl:otherwise>
+        <xsl:variable name="is-equal-contrib" select="if ($contrib-group/contrib[@contrib-type='author'][1]/@equal-contrib='yes') then true() else false()"/>
+        
+        <xsl:value-of select="concat(e:get-surname($contrib-group/contrib[@contrib-type='author'][1]),' et al')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-surname" as="text()">
+    <xsl:param name="contrib"/>
+    <xsl:choose>
+      <xsl:when test="$contrib/collab">
+        <xsl:value-of select="$contrib/collab[1]/text()[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="$contrib//name[1]/surname[1]"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <pattern id="author-corresp-checks-pattern">
+    <rule context="contrib[@contrib-type='author']" id="author-corresp-checks">
+      <report test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')" role="error" id="author-equal-contrib-1">[author-equal-contrib-1] Author <value-of select="e:get-name(name[1])"/> does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'.</report>
+    </rule>
+  </pattern>
+  <pattern id="root-pattern">
+    <rule context="root" id="root-rule">
+      <assert test="descendant::contrib[@contrib-type='author']" role="error" id="author-corresp-checks-xspec-assert">contrib[@contrib-type='author'] must be present.</assert>
+    </rule>
+  </pattern>
+</schema>
\ No newline at end of file
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-1/fail.xml b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/fail.xml
new file mode 100644
index 0000000000..ffe6198311
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/fail.xml
@@ -0,0 +1,22 @@
+<?oxygen SCHSchema="author-equal-contrib-1.sch"?>
+<!--Context: contrib[@contrib-type='author']
+Test: report    (xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')
+Message: Author  does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'. -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <article-meta>
+            <contrib-group>
+                <contrib contrib-type="author">
+                    <name>
+                        <surname>Claus</surname>
+                        <given-names>Santa</given-names>
+                    </name>
+                    <xref ref-type="author-notes" rid="n1">*</xref>
+                </contrib>
+            </contrib-group>
+            <author-notes>
+                <fn fn-type="equal" id="n1"/>
+            </author-notes>
+        </article-meta>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-1/pass.xml b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/pass.xml
new file mode 100644
index 0000000000..7c49435749
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-1/pass.xml
@@ -0,0 +1,22 @@
+<?oxygen SCHSchema="author-equal-contrib-1.sch"?>
+<!--Context: contrib[@contrib-type='author']
+Test: report    (xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')
+Message: Author  does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'. -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <article-meta>
+            <contrib-group>
+                <contrib contrib-type="author" equal-contrib="yes">
+                    <name>
+                        <surname>Claus</surname>
+                        <given-names>Santa</given-names>
+                    </name>
+                    <xref ref-type="author-notes" rid="n1">*</xref>
+                </contrib>
+            </contrib-group>
+            <author-notes>
+                <fn fn-type="equal" id="n1"/>
+            </author-notes>
+        </article-meta>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-2/author-equal-contrib-2.sch b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/author-equal-contrib-2.sch
new file mode 100644
index 0000000000..097ba325e5
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/author-equal-contrib-2.sch
@@ -0,0 +1,157 @@
+<schema xmlns="http://purl.oclc.org/dsdl/schematron" xmlns:meca="http://manuscriptexchange.org" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:file="java.io.File" xmlns:java="http://www.java.com/" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xlink="http://www.w3.org/1999/xlink" queryBinding="xslt2">
+  <title>eLife reviewed preprint schematron</title>
+  <ns uri="http://www.niso.org/schemas/ali/1.0/" prefix="ali"/>
+  <ns uri="http://www.w3.org/XML/1998/namespace" prefix="xml"/>
+  <ns uri="http://www.w3.org/1999/xlink" prefix="xlink"/>
+  <ns uri="http://www.w3.org/2001/XInclude" prefix="xi"/>
+  <ns uri="http://www.w3.org/1998/Math/MathML" prefix="mml"/>
+  <ns uri="http://saxon.sf.net/" prefix="saxon"/>
+  <ns uri="http://purl.org/dc/terms/" prefix="dc"/>
+  <ns uri="http://www.w3.org/2001/XMLSchema" prefix="xs"/>
+  <ns uri="https://elifesciences.org/namespace" prefix="e"/>
+  <ns uri="java.io.File" prefix="file"/>
+  <ns uri="http://www.java.com/" prefix="java"/>
+  <ns uri="http://manuscriptexchange.org" prefix="meca"/>
+  <xsl:function name="e:isbn-sum" as="xs:integer">
+    <xsl:param name="s" as="xs:string"/>
+    <xsl:choose>
+      <xsl:when test="string-length($s) = 10">
+        <xsl:variable name="d1" select="number(substring($s,1,1)) * 10"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 9"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1)) * 8"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 7"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1)) * 6"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 5"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1)) * 4"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1)) * 2"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 1"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10) mod 11"/>
+      </xsl:when>
+      <xsl:when test="string-length($s) = 13">
+        <xsl:variable name="d1" select="number(substring($s,1,1))"/>
+        <xsl:variable name="d2" select="number(substring($s,2,1)) * 3"/>
+        <xsl:variable name="d3" select="number(substring($s,3,1))"/>
+        <xsl:variable name="d4" select="number(substring($s,4,1)) * 3"/>
+        <xsl:variable name="d5" select="number(substring($s,5,1))"/>
+        <xsl:variable name="d6" select="number(substring($s,6,1)) * 3"/>
+        <xsl:variable name="d7" select="number(substring($s,7,1))"/>
+        <xsl:variable name="d8" select="number(substring($s,8,1)) * 3"/>
+        <xsl:variable name="d9" select="number(substring($s,9,1))"/>
+        <xsl:variable name="d10" select="number(substring($s,10,1)) * 3"/>
+        <xsl:variable name="d11" select="number(substring($s,11,1))"/>
+        <xsl:variable name="d12" select="number(substring($s,12,1)) * 3"/>
+        <xsl:variable name="d13" select="number(substring($s,13,1))"/>
+        <xsl:value-of select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7 + $d8 + $d9 + $d10 + $d11 + $d12 + $d13) mod 10"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="number('1')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:is-valid-issn" as="xs:boolean">
+      <xsl:param name="s" as="xs:string"/>
+      <xsl:choose>
+        <xsl:when test="not(matches($s,'^\d{4}\-\d{3}[\dX]$'))">
+          <xsl:value-of select="false()"/>
+        </xsl:when>
+        <xsl:otherwise>
+            <xsl:variable name="d1" select="number(substring($s,1,1)) * 8"/>
+            <xsl:variable name="d2" select="number(substring($s,2,1)) * 7"/>
+            <xsl:variable name="d3" select="number(substring($s,3,1)) * 6"/>
+            <xsl:variable name="d4" select="number(substring($s,4,1)) * 5"/>
+            <xsl:variable name="d5" select="number(substring($s,6,1)) * 4"/>
+            <xsl:variable name="d6" select="number(substring($s,7,1)) * 3"/>
+            <xsl:variable name="d7" select="number(substring($s,8,1)) * 2"/>
+            <xsl:variable name="remainder" select="number($d1 + $d2 + $d3 + $d4 + $d5 + $d6 + $d7) mod 11"/>
+            <xsl:variable name="calc" select="if ($remainder=0) then 0 else (11 - $remainder)"/>
+            <xsl:variable name="check" select="if (substring($s,9,1)='X') then 10 else number(substring($s,9,1))"/>
+            <xsl:value-of select="$calc = $check"/>
+        </xsl:otherwise>
+      </xsl:choose>
+    </xsl:function>
+  <xsl:function name="e:get-name" as="xs:string">
+    <xsl:param name="name"/>
+    <xsl:choose>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and $name/suffix[1]">
+        <xsl:value-of select="concat($name/surname[1],' ',$name/suffix[1])"/>
+      </xsl:when>
+      <xsl:when test="$name/given-names[1] and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="concat($name/given-names[1],' ',$name/surname[1])"/>
+      </xsl:when>
+      <xsl:when test="not($name/given-names[1]) and $name/surname[1] and not($name/suffix[1])">
+        <xsl:value-of select="$name/surname[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="'No elements present'"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-copyright-holder">
+    <xsl:param name="contrib-group"/>
+    <xsl:variable name="author-count" select="count($contrib-group/contrib[@contrib-type='author'])"/>
+    <xsl:choose>
+      <xsl:when test="$author-count lt 1"/>
+      <xsl:when test="$author-count = 1">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1]"/>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="$contrib-group/contrib[@contrib-type='author']/name[1]/surname[1]"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      <xsl:when test="$author-count = 2">
+        <xsl:choose>
+          <xsl:when test="$contrib-group/contrib[@contrib-type='author']/collab">
+            <xsl:choose>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab and $contrib-group/contrib[@contrib-type='author'][2]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author']/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author']/collab[2]/text()[1])"/>
+              </xsl:when>
+              <xsl:when test="$contrib-group/contrib[@contrib-type='author'][1]/collab">
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/collab[1]/text()[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+              </xsl:when>
+              <xsl:otherwise>
+                <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/collab[1]/text()[1])"/>
+              </xsl:otherwise>
+            </xsl:choose>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="concat($contrib-group/contrib[@contrib-type='author'][1]/name[1]/surname[1],' &amp; ',$contrib-group/contrib[@contrib-type='author'][2]/name[1]/surname[1])"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
+      
+      <xsl:otherwise>
+        <xsl:variable name="is-equal-contrib" select="if ($contrib-group/contrib[@contrib-type='author'][1]/@equal-contrib='yes') then true() else false()"/>
+        
+        <xsl:value-of select="concat(e:get-surname($contrib-group/contrib[@contrib-type='author'][1]),' et al')"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <xsl:function name="e:get-surname" as="text()">
+    <xsl:param name="contrib"/>
+    <xsl:choose>
+      <xsl:when test="$contrib/collab">
+        <xsl:value-of select="$contrib/collab[1]/text()[1]"/>
+      </xsl:when>
+      <xsl:otherwise>
+        <xsl:value-of select="$contrib//name[1]/surname[1]"/>
+      </xsl:otherwise>
+    </xsl:choose>
+  </xsl:function>
+  <pattern id="author-corresp-checks-pattern">
+    <rule context="contrib[@contrib-type='author']" id="author-corresp-checks">
+      <report test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'" role="error" id="author-equal-contrib-2">[author-equal-contrib-2] Author <value-of select="e:get-name(name[1])"/> has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'.</report>
+    </rule>
+  </pattern>
+  <pattern id="root-pattern">
+    <rule context="root" id="root-rule">
+      <assert test="descendant::contrib[@contrib-type='author']" role="error" id="author-corresp-checks-xspec-assert">contrib[@contrib-type='author'] must be present.</assert>
+    </rule>
+  </pattern>
+</schema>
\ No newline at end of file
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-2/fail.xml b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/fail.xml
new file mode 100644
index 0000000000..3b41c4e5bb
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/fail.xml
@@ -0,0 +1,21 @@
+<?oxygen SCHSchema="author-equal-contrib-2.sch"?>
+<!--Context: contrib[@contrib-type='author']
+Test: report    not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'
+Message: Author  has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'. -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <article-meta>
+            <contrib-group>
+                <contrib contrib-type="author" equal-contrib="yes">
+                    <name>
+                        <surname>Claus</surname>
+                        <given-names>Santa</given-names>
+                    </name>
+                </contrib>
+            </contrib-group>
+            <author-notes>
+                <fn fn-type="equal" id="n1"/>
+            </author-notes>
+        </article-meta>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/tests/rp/author-corresp-checks/author-equal-contrib-2/pass.xml b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/pass.xml
new file mode 100644
index 0000000000..0c6a5902a8
--- /dev/null
+++ b/test/tests/rp/author-corresp-checks/author-equal-contrib-2/pass.xml
@@ -0,0 +1,22 @@
+<?oxygen SCHSchema="author-equal-contrib-2.sch"?>
+<!--Context: contrib[@contrib-type='author']
+Test: report    not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'
+Message: Author  has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'. -->
+<root xmlns:ali="http://www.niso.org/schemas/ali/1.0/" xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">
+    <article>
+        <article-meta>
+            <contrib-group>
+                <contrib contrib-type="author" equal-contrib="yes">
+                    <name>
+                        <surname>Claus</surname>
+                        <given-names>Santa</given-names>
+                    </name>
+                    <xref ref-type="author-notes" rid="n1">*</xref>
+                </contrib>
+            </contrib-group>
+            <author-notes>
+                <fn fn-type="equal" id="n1"/>
+            </author-notes>
+        </article-meta>
+    </article>
+</root>
\ No newline at end of file
diff --git a/test/xspec/rp-schematron.sch b/test/xspec/rp-schematron.sch
index 601802fea4..d25ca8236d 100644
--- a/test/xspec/rp-schematron.sch
+++ b/test/xspec/rp-schematron.sch
@@ -199,6 +199,10 @@
         <report test="@corresp='yes' and not(email) and not(xref[@ref-type='corresp'])" role="error" id="author-corresp-no-email">Author <value-of select="e:get-name(name[1])"/> has the attribute corresp="yes", but they do not have a child email element or an xref with the attribute ref-type="corresp".</report>
         
         <report test="not(@corresp='yes') and (email or xref[@ref-type='corresp'])" role="error" id="author-email-no-corresp">Author <value-of select="e:get-name(name[1])"/> does not have the attribute corresp="yes", but they have a child email element or an xref with the attribute ref-type="corresp".</report>
+        
+        <report test="(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and not(@equal-contrib='yes')" role="error" id="author-equal-contrib-1">Author <value-of select="e:get-name(name[1])"/> does not have the attribute equal-contrib="yes", but they have a child xref element that points to a footnote with the fn-type 'equal'.</report>
+        
+        <report test="not(xref/@rid = ancestor::article-meta/author-notes/fn[@fn-type='equal']/@id) and @equal-contrib='yes'" role="error" id="author-equal-contrib-2">Author <value-of select="e:get-name(name[1])"/> has the attribute equal-contrib="yes", but they do not have a child xref element that points to a footnote with the fn-type 'equal'.</report>
      </rule>
   </pattern>
   <pattern id="name-tests-pattern">
diff --git a/test/xspec/rp-schematron.xspec b/test/xspec/rp-schematron.xspec
index 2b045a7acf..af6d778db4 100644
--- a/test/xspec/rp-schematron.xspec
+++ b/test/xspec/rp-schematron.xspec
@@ -109,6 +109,26 @@
         <x:expect-report id="author-email-no-corresp" role="error"/>
         <x:expect-not-assert id="author-corresp-checks-xspec-assert" role="error"/>
       </x:scenario>
+      <x:scenario label="author-equal-contrib-1-pass">
+        <x:context href="../tests/rp/author-corresp-checks/author-equal-contrib-1/pass.xml"/>
+        <x:expect-not-report id="author-equal-contrib-1" role="error"/>
+        <x:expect-not-assert id="author-corresp-checks-xspec-assert" role="error"/>
+      </x:scenario>
+      <x:scenario label="author-equal-contrib-1-fail">
+        <x:context href="../tests/rp/author-corresp-checks/author-equal-contrib-1/fail.xml"/>
+        <x:expect-report id="author-equal-contrib-1" role="error"/>
+        <x:expect-not-assert id="author-corresp-checks-xspec-assert" role="error"/>
+      </x:scenario>
+      <x:scenario label="author-equal-contrib-2-pass">
+        <x:context href="../tests/rp/author-corresp-checks/author-equal-contrib-2/pass.xml"/>
+        <x:expect-not-report id="author-equal-contrib-2" role="error"/>
+        <x:expect-not-assert id="author-corresp-checks-xspec-assert" role="error"/>
+      </x:scenario>
+      <x:scenario label="author-equal-contrib-2-fail">
+        <x:context href="../tests/rp/author-corresp-checks/author-equal-contrib-2/fail.xml"/>
+        <x:expect-report id="author-equal-contrib-2" role="error"/>
+        <x:expect-not-assert id="author-corresp-checks-xspec-assert" role="error"/>
+      </x:scenario>
     </x:scenario>
     <x:scenario label="name-tests">
       <x:scenario label="surname-test-1-pass">