diff --git a/specifications/xpath-functions-40/src/function-catalog.xml b/specifications/xpath-functions-40/src/function-catalog.xml
index c3c4b8832..db349864c 100644
--- a/specifications/xpath-functions-40/src/function-catalog.xml
+++ b/specifications/xpath-functions-40/src/function-catalog.xml
@@ -19119,6 +19119,18 @@ return tokenize(normalize-space($s), ' ')[. castable as xs:IDREF]</eg>
                   <td/>
                   <td>absent</td>
                </tr>
+               <tr>
+                  <td>
+                     <code>json-lines</code>
+                  </td>
+                  <td>
+                     <code>xs:boolean?</code>
+                  </td>
+                  <td><code>true()</code> means <code>"yes"</code>, <code>false()</code> means <code>"no"</code></td>
+                  <td>
+                     <code>no</code>
+                  </td>
+               </tr>
                <tr>
                   <td>
                      <code>json-node-output-method</code>
diff --git a/specifications/xslt-xquery-serialization-40/src/bibl.xml b/specifications/xslt-xquery-serialization-40/src/bibl.xml
index e7492dd5d..96b67c90e 100644
--- a/specifications/xslt-xquery-serialization-40/src/bibl.xml
+++ b/specifications/xslt-xquery-serialization-40/src/bibl.xml
@@ -63,6 +63,12 @@ Unicode Consortium.
 Unicode Standard Annex #15.
 </bibl>
 
+<bibl id="JSON-LINES"
+      key="JSON Lines">
+<titleref href="https://jsonlines.org/">JSON Lines</titleref>.
+Maintained by Ian Ward.
+</bibl>
+
 <bibl id="xhtml1" key="XHTML 1.0"/>
 
 <bibl id="xhtml11" key="XHTML 1.1"/>
diff --git a/specifications/xslt-xquery-serialization-40/src/schema-for-serialization-parameters.xsd b/specifications/xslt-xquery-serialization-40/src/schema-for-serialization-parameters.xsd
index 5f2b09318..53b7b04c7 100644
--- a/specifications/xslt-xquery-serialization-40/src/schema-for-serialization-parameters.xsd
+++ b/specifications/xslt-xquery-serialization-40/src/schema-for-serialization-parameters.xsd
@@ -131,6 +131,16 @@
     </xs:union>
   </xs:simpleType>
 
+  <!--
+     - Serialization parameter element for json-lines
+       parameter
+    -->
+  <xs:element id="json-lines" 
+              name="json-linestype"
+              type="output:yes-no-param-type"
+              substitutionGroup
+              = "output:serialization-parameter-element"/>
+
   <xs:simpleType name="method-type">
     <xs:union>
       <xs:simpleType>
diff --git a/specifications/xslt-xquery-serialization-40/src/xslt-xquery-serialization.xml b/specifications/xslt-xquery-serialization-40/src/xslt-xquery-serialization.xml
index 571be7ca4..33a05d709 100644
--- a/specifications/xslt-xquery-serialization-40/src/xslt-xquery-serialization.xml
+++ b/specifications/xslt-xquery-serialization-40/src/xslt-xquery-serialization.xml
@@ -646,6 +646,9 @@ nodes.</p></note></div1>
     <change issue="530" PR="534" date="2023-06-06">
       Added the <code>escape-solidus</code> parameter for JSON serialization.
     </change>
+    <change issue="1471" date="2024-10-15">
+      Added the <code>json-lines</code> parameter for JSON serialization.
+    </change>
   </changes>
 <p>There are a number of parameters that influence how serialization
 is performed. <termref def="host-language">Host languages</termref> <rfc2119>MAY</rfc2119> allow users to specify any or all of these parameters, but
@@ -728,6 +731,10 @@ This parameter <rfc2119>MAY</rfc2119> be absent.</td>
 <tr><td rowspan="1" colspan="1"><code>item-separator</code></td><td rowspan="1" colspan="1">A string of Unicode characters.  This
 parameter <rfc2119>MAY</rfc2119> be absent.</td></tr>
 
+<tr><td rowspan="1" colspan="1"><code>json-lines</code></td><td rowspan="1" colspan="1">One of the enumerated values 
+<code>yes</code>, <code>no</code>, <code>true</code>, <code>false</code>, <code>1</code> or <code>0</code>.
+</td></tr>
+
 <tr>
 <td rowspan="1" colspan="1"><code>json-node-output-method</code></td>
 <td rowspan="1" colspan="1">An expanded QName 
@@ -3400,14 +3407,32 @@ is described in <specref ref="serdm"/>.</p>
     <change issue="530" PR="534" date="2023-06-06">
       Added the <code>escape-solidus</code> parameter for JSON serialization.
     </change>
+    <change issue="1471" date="2024-10-15">
+      Added the <code>json-lines</code> parameter for JSON serialization.
+    </change>
   </changes>
 
-  <p>The JSON output method serializes the <termref diff="chg" at="2023-11-01" def="dt-input-tree"/> as
-a JSON value using the JSON syntax defined in <bibref ref="rfc7159"/>.
-Sequence normalization is not performed for this output method.
-</p>
-<ulist>
+  <p>The JSON output method serializes the <termref diff="chg" at="2023-11-01" def="dt-input-tree"/>
+    using the JSON syntax defined in <bibref ref="rfc7159"/>.
+    Sequence normalization is not performed for this output method.
+    A list with values to be serialized is created from the <termref def="dt-input-value"/>,
+    depending on the value of the <code>json-lines</code> parameter:</p>
+
+  <ulist>
+    <item>
+      <p>If the value is one of <code>yes</code>, <code>true</code> or <code>1</code>,
+        each item of the input value becomes a separate list entry.
+      </p>
+    </item>
+    <item>
+      <p>For all other values, the input value becomes a single list entry.</p>
+    </item>
+  </ulist>
 
+  <p>The serialized entries of the list are separated by the character <char>U+000A</char>.
+     The entries are serialized as follows:</p>
+
+<ulist>
 <item><p>An <termref def="dt-array-item">array item</termref> in the
   <termref diff="chg" at="2023-11-01" def="dt-input-tree"/> is
 serialized to a JSON array by outputting the serialized JSON value of
@@ -3603,16 +3628,14 @@ one of the values <code>yes</code>, <code>true</code> or <code>1</code>,
 the <termref
 def="serializer">serializer</termref> <rfc2119>MAY</rfc2119> output
 additional whitespace characters adjacent to the JSON structural
-tokens.  If the <code>indent</code> parameter has the value
-<code>no</code>, <code>false</code> or <code>0</code>, 
-the <termref def="serializer">serializer</termref>
+tokens. For all other values, the <termref def="serializer">serializer</termref>
 <rfc2119>MUST</rfc2119> output no whitespace characters adjacent to
 the JSON structural tokens.
 </p>
-<p>
-The <code>suppress-indentation</code> parameter is not applicable to
-the JSON output method.
-</p>
+<p>If <code>json-lines</code> has one of the values <code>yes</code>, <code>true</code> or
+<code>1</code>, indentation is allowed, but the output whitespace characters may not contain
+the character <char>U+000A</char>.</p>
+
 </div3>
 
 
@@ -3663,17 +3686,6 @@ the byte-order mark).</p>
   element, since an unintended <code>&lt;/script></code> end tag might otherwise cause the script to be prematurely
   terminated. In other situations, however, the escaping creates visual clutter and makes the output less readable.</p></note></div3>
   
-
-
-
-
-<div3 id="JSON_ITEM-SEPARATOR">
-<head>JSON Output Method: the <code>item-separator</code> Parameter</head>
-
-<p>The <code>item-separator</code> serialization 
-parameter is not applicable to the JSON output method.</p>
-</div3>
-
 <div3 id="JSON_ALLOW-DUPLICATE-NAMES">
 <head>JSON Output Method: the <code>allow-duplicate-names</code> Parameter</head>
 <p>The <code>allow-duplicate-names</code> serialization parameter
@@ -3702,6 +3714,13 @@ set to <code>yes</code>.
 </p>
 </div3>
 
+<div3 id="JSON_JSON-LINES">
+<head>JSON Output Method: the <code>json-lines</code> Parameter</head>
+<p>The <code>json-lines</code> serialization parameter determines if items are serialized
+according to the <bibref ref="JSON-LINES"/> format and as described in <specref ref="json-output"/>.
+</p>
+</div3>
+
 </div2>
 </div1>
 
@@ -4006,7 +4025,6 @@ adjacent serialized items.
 </div3>
 
 
-
 </div2>
 </div1>