diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTAttributesHandlerType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTAttributesHandlerType.java
index 1aa1307..98aaec3 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTAttributesHandlerType.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTAttributesHandlerType.java
@@ -18,7 +18,6 @@
 package com.io7m.blackthorne.api;
 
 import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
 
 /**
  * A function that, given a set of attributes, returns a {@code T}.
@@ -36,11 +35,11 @@ public interface BTAttributesHandlerType<T>
    *
    * @return A value of {@code T}
    *
-   * @throws SAXException On errors
+   * @throws Exception On errors
    */
 
   T parse(
     BTElementParsingContextType context,
     Attributes attributes)
-    throws SAXException;
+    throws Exception;
 }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTCharacterHandlerType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTCharacterHandlerType.java
index 059cfc2..81820d3 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTCharacterHandlerType.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTCharacterHandlerType.java
@@ -17,8 +17,6 @@
 
 package com.io7m.blackthorne.api;
 
-import org.xml.sax.SAXException;
-
 /**
  * A function that, given a string, returns a {@code T}.
  *
@@ -37,7 +35,7 @@ public interface BTCharacterHandlerType<T>
    *
    * @return A value of {@code T}
    *
-   * @throws SAXException On errors
+   * @throws Exception On errors
    */
 
   T parse(
@@ -45,5 +43,5 @@ T parse(
     char[] characters,
     int offset,
     int length)
-    throws SAXException;
+    throws Exception;
 }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandler.java
index fcb99f5..58b54bb 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandler.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandler.java
@@ -17,12 +17,6 @@
 package com.io7m.blackthorne.api;
 
 import com.io7m.jlexing.core.LexicalPosition;
-import java.net.URI;
-import java.util.HashMap;
-import java.util.Map;
-import java.util.Objects;
-import java.util.Optional;
-import java.util.function.Consumer;
 import org.xml.sax.Attributes;
 import org.xml.sax.Locator;
 import org.xml.sax.SAXException;
@@ -30,6 +24,13 @@
 import org.xml.sax.ext.DefaultHandler2;
 import org.xml.sax.ext.Locator2;
 
+import java.net.URI;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Optional;
+import java.util.function.Consumer;
+
 /**
  * A dispatching handler that produces values of type {@code T}. The handler is responsible for
  * instantiating a content handler based on the received document namespace URI.
@@ -95,6 +96,18 @@ public static <U> BTContentHandlerBuilderType<U> builder(
     return new Builder<>();
   }
 
+  private static String messageOrException(
+    final Exception e)
+  {
+    final var messageOrNull = e.getMessage();
+    if (messageOrNull == null) {
+      return String.format(
+        "No error message provided for exception %s",
+        e.getClass().getName());
+    }
+    return messageOrNull;
+  }
+
   @Override
   public void setDocumentLocator(
     final Locator in_locator)
@@ -109,12 +122,13 @@ public void startElement(
     final String localName,
     final String qualifiedName,
     final Attributes attributes)
-    throws SAXException
   {
     try {
       this.stackHandler.onElementStarted(namespaceURI, localName, attributes);
     } catch (final SAXParseException e) {
       this.error(e);
+    } catch (final Exception e) {
+      this.error(this.saxParseExceptionOf(e));
     }
   }
 
@@ -123,12 +137,13 @@ public void endElement(
     final String namespaceURI,
     final String localName,
     final String qualifiedName)
-    throws SAXException
   {
     try {
       this.stackHandler.onElementFinished(namespaceURI, localName);
     } catch (final SAXParseException e) {
       this.error(e);
+    } catch (final Exception e) {
+      this.error(this.saxParseExceptionOf(e));
     }
   }
 
@@ -137,12 +152,13 @@ public void characters(
     final char[] ch,
     final int start,
     final int length)
-    throws SAXException
   {
     try {
       this.stackHandler.onCharacters(ch, start, length);
     } catch (final SAXParseException e) {
       this.error(e);
+    } catch (final Exception e) {
+      this.error(this.saxParseExceptionOf(e));
     }
   }
 
@@ -189,18 +205,6 @@ public void fatalError(
     throw e;
   }
 
-  private static String messageOrException(
-    final Exception e)
-  {
-    final var messageOrNull = e.getMessage();
-    if (messageOrNull == null) {
-      return String.format(
-        "No error message provided for exception %s",
-        e.getClass().getName());
-    }
-    return messageOrNull;
-  }
-
   private LexicalPosition<URI> currentLexical()
   {
     final LexicalPosition<URI> lexicalPosition;
@@ -223,6 +227,12 @@ private LexicalPosition<URI> currentLexical()
     return lexicalPosition;
   }
 
+  private SAXParseException saxParseExceptionOf(
+    final Exception e)
+  {
+    return new SAXParseException(e.getLocalizedMessage(), this.locator, e);
+  }
+
   /**
    * @return The parsed value
    */
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandlerBuilderType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandlerBuilderType.java
index f5e08ee..82d7f2e 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandlerBuilderType.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTContentHandlerBuilderType.java
@@ -55,7 +55,9 @@ default BTContentHandlerBuilderType<T> addHandler(
     final String localName,
     final BTElementHandlerConstructorType<?, T> constructor)
   {
-    return this.addHandler(BTQualifiedName.of(namespaceURI, localName), constructor);
+    return this.addHandler(
+      BTQualifiedName.of(namespaceURI, localName),
+      constructor);
   }
 
   /**
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerConstructorType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerConstructorType.java
index fe77823..7ab2e40 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerConstructorType.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerConstructorType.java
@@ -16,8 +16,6 @@
 
 package com.io7m.blackthorne.api;
 
-import org.xml.sax.SAXException;
-
 /**
  * A content handler constructor that produces handlers that produce values of type {@code A}
  *
@@ -34,11 +32,11 @@ public interface BTElementHandlerConstructorType<CT, RT>
    *
    * @return A new content handler
    *
-   * @throws SAXException If required
+   * @throws Exception If required
    * @see BTElementParsingContextType#parseException(Exception)
    */
 
   BTElementHandlerType<? extends CT, ? extends RT> create(
     BTElementParsingContextType context)
-    throws SAXException;
+    throws Exception;
 }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerType.java
index a72f659..7d5c724 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerType.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTElementHandlerType.java
@@ -18,7 +18,6 @@
 package com.io7m.blackthorne.api;
 
 import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
 
 import java.util.Map;
 import java.util.function.Function;
@@ -82,13 +81,13 @@ default BTIgnoreUnrecognizedElements onShouldIgnoreUnrecognizedElements(
    * @param context    The parsing context
    * @param attributes The element's attributes
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   default void onElementStart(
     final BTElementParsingContextType context,
     final Attributes attributes)
-    throws SAXException
+    throws Exception
   {
 
   }
@@ -101,11 +100,11 @@ default void onElementStart(
    *
    * @return The value produced by all of the data received up to this point
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   RT onElementFinished(BTElementParsingContextType context)
-    throws SAXException;
+    throws Exception;
 
   /**
    * A child element has been parsed successfully and produced a result.
@@ -113,13 +112,13 @@ RT onElementFinished(BTElementParsingContextType context)
    * @param context The parsing context
    * @param result  The value produced by the child element
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   default void onChildValueProduced(
     final BTElementParsingContextType context,
     final CT result)
-    throws SAXException
+    throws Exception
   {
 
   }
@@ -132,7 +131,7 @@ default void onChildValueProduced(
    * @param offset  The start of the data within {@code data}
    * @param length  The length of the data within {@code data}
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   default void onCharacters(
@@ -140,7 +139,7 @@ default void onCharacters(
     final char[] data,
     final int offset,
     final int length)
-    throws SAXException
+    throws Exception
   {
 
   }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTException.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTException.java
index 413539c..011ad71 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTException.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTException.java
@@ -27,15 +27,6 @@ public final class BTException extends Exception
 {
   private final List<BTParseError> errors;
 
-  /**
-   * @return The parse errors encountered during parsing
-   */
-
-  public List<BTParseError> errors()
-  {
-    return this.errors;
-  }
-
   /**
    * Construct an exception.
    *
@@ -84,4 +75,13 @@ public BTException(
     super(Objects.requireNonNull(inCause, "cause"));
     this.errors = Objects.requireNonNull(inErrors, "errors");
   }
+
+  /**
+   * @return The parse errors encountered during parsing
+   */
+
+  public List<BTParseError> errors()
+  {
+    return this.errors;
+  }
 }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTFunctorHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTFunctorHandler.java
index edeb756..30337cc 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTFunctorHandler.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTFunctorHandler.java
@@ -18,7 +18,6 @@
 package com.io7m.blackthorne.api;
 
 import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
 
 import java.util.Map;
 import java.util.Objects;
@@ -76,7 +75,7 @@ public BTIgnoreUnrecognizedElements onShouldIgnoreUnrecognizedElements(
   public void onElementStart(
     final BTElementParsingContextType context,
     final Attributes attributes)
-    throws SAXException
+    throws Exception
   {
     this.handler.onElementStart(context, attributes);
   }
@@ -85,7 +84,7 @@ public void onElementStart(
   public void onChildValueProduced(
     final BTElementParsingContextType context,
     final A result)
-    throws SAXException
+    throws Exception
   {
     this.handler.onChildValueProduced(context, result);
   }
@@ -96,14 +95,14 @@ public void onCharacters(
     final char[] data,
     final int offset,
     final int length)
-    throws SAXException
+    throws Exception
   {
     this.handler.onCharacters(context, data, offset, length);
   }
 
   @Override
   public C onElementFinished(final BTElementParsingContextType context)
-    throws SAXException
+    throws Exception
   {
     return this.function.apply(this.handler.onElementFinished(context));
   }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandler.java
deleted file mode 100644
index 42265ce..0000000
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandler.java
+++ /dev/null
@@ -1,80 +0,0 @@
-/*
- * Copyright © 2019 Mark Raynsford <code@io7m.com> http://io7m.com
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
- * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-
-package com.io7m.blackthorne.api;
-
-import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
-
-import java.util.Objects;
-
-/**
- * A convenient handler dealing with elements that do not have children.
- *
- * @param <S> The type of returned values
- */
-
-public final class BTLeafElementHandler<S>
-  implements BTElementHandlerType<Object, S>
-{
-  private final BTQualifiedName name;
-  private final BTLeafElementHandlerType<S> handler;
-  private S result;
-
-  /**
-   * Construct a handler.
-   *
-   * @param inName    The name of elements handled by this handler
-   * @param inHandler The element handler
-   */
-
-  public BTLeafElementHandler(
-    final BTQualifiedName inName,
-    final BTLeafElementHandlerType<S> inHandler)
-  {
-    this.name =
-      Objects.requireNonNull(inName, "name");
-    this.handler =
-      Objects.requireNonNull(inHandler, "handler");
-  }
-
-  @Override
-  public String name()
-  {
-    return this.name.localName();
-  }
-
-  @Override
-  public void onElementStart(
-    final BTElementParsingContextType context,
-    final Attributes attributes)
-    throws SAXException
-  {
-    try {
-      this.result = this.handler.onElement(context, attributes);
-    } catch (final Exception e) {
-      throw context.parseException(e);
-    }
-  }
-
-  @Override
-  public S onElementFinished(
-    final BTElementParsingContextType context)
-  {
-    return this.result;
-  }
-}
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandlerType.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandlerType.java
deleted file mode 100644
index c15f070..0000000
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTLeafElementHandlerType.java
+++ /dev/null
@@ -1,45 +0,0 @@
-/*
- * Copyright © 2020 Mark Raynsford <code@io7m.com> http://io7m.com
- *
- * Permission to use, copy, modify, and/or distribute this software for any
- * purpose with or without fee is hereby granted, provided that the above
- * copyright notice and this permission notice appear in all copies.
- *
- * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
- * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
- * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
- * SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
- * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
- * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR
- * IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
- */
-
-package com.io7m.blackthorne.api;
-
-import org.xml.sax.Attributes;
-
-/**
- * An element handler that takes the attributes of a single element and
- * produces an output value.
- *
- * @param <S> The type of returned values
- */
-
-public interface BTLeafElementHandlerType<S>
-{
-  /**
-   * Process the attributes of an element.
-   *
-   * @param context    The parse context
-   * @param attributes The element attributes
-   *
-   * @return A value of {@code S}
-   *
-   * @throws Exception On errors
-   */
-
-  S onElement(
-    BTElementParsingContextType context,
-    Attributes attributes)
-    throws Exception;
-}
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarAttributeHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarAttributeHandler.java
index c10c969..3096ece 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarAttributeHandler.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarAttributeHandler.java
@@ -18,7 +18,6 @@
 package com.io7m.blackthorne.api;
 
 import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
 
 import java.util.Objects;
 
@@ -59,7 +58,7 @@ public String name()
   public void onElementStart(
     final BTElementParsingContextType context,
     final Attributes attributes)
-    throws SAXException
+    throws Exception
   {
     this.result = this.handler.parse(context, attributes);
   }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarElementHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarElementHandler.java
index dca9a8b..ac98b08 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarElementHandler.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTScalarElementHandler.java
@@ -17,8 +17,6 @@
 
 package com.io7m.blackthorne.api;
 
-import org.xml.sax.SAXException;
-
 import java.util.Objects;
 
 /**
@@ -60,7 +58,7 @@ public void onCharacters(
     final char[] data,
     final int offset,
     final int length)
-    throws SAXException
+    throws Exception
   {
     this.result = this.handler.parse(context, data, offset, length);
   }
diff --git a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTStackHandler.java b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTStackHandler.java
index 11ed3f0..3cc4577 100644
--- a/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTStackHandler.java
+++ b/com.io7m.blackthorne.api/src/main/java/com/io7m/blackthorne/api/BTStackHandler.java
@@ -21,7 +21,6 @@
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.xml.sax.Attributes;
-import org.xml.sax.SAXException;
 import org.xml.sax.SAXParseException;
 import org.xml.sax.ext.Locator2;
 
@@ -115,14 +114,14 @@ private void trace(
    * @param localName    The local element name
    * @param attributes   The element attributes
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   public void onElementStarted(
     final String namespaceURI,
     final String localName,
     final Attributes attributes)
-    throws SAXException
+    throws Exception
   {
     try {
       Objects.requireNonNull(namespaceURI, "namespaceURI");
@@ -150,7 +149,10 @@ public void onElementStarted(
         final var rootHandlerConstructor = this.rootHandlers.get(qualifiedName);
         if (rootHandlerConstructor == null) {
           throw new SAXParseException(
-            BTMessages.format("errorRootElementNotAllowed", localName, namespaceURI),
+            BTMessages.format(
+              "errorRootElementNotAllowed",
+              localName,
+              namespaceURI),
             this.context.documentLocator());
         }
 
@@ -215,7 +217,9 @@ public void onElementStarted(
        */
 
       final var newHandler =
-        Objects.requireNonNull(childHandlerConstructor, "childHandlerConstructor")
+        Objects.requireNonNull(
+          childHandlerConstructor,
+          "childHandlerConstructor")
           .create(this.context);
 
       Objects.requireNonNull(newHandler, "newHandler");
@@ -235,14 +239,14 @@ public void onElementStarted(
    * @param offset The starting offset into {@code data}
    * @param length The length of the data in {@code data}
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   public void onCharacters(
     final char[] data,
     final int offset,
     final int length)
-    throws SAXException
+    throws Exception
   {
     try {
       Objects.requireNonNull(data, "data");
@@ -277,13 +281,13 @@ public void onCharacters(
    * @param namespaceURI The namespace URI
    * @param localName    The local element name
    *
-   * @throws SAXException On parse errors
+   * @throws Exception On parse errors
    */
 
   public void onElementFinished(
     final String namespaceURI,
     final String localName)
-    throws SAXException
+    throws Exception
   {
     try {
       Objects.requireNonNull(namespaceURI, "namespaceURI");
diff --git a/com.io7m.blackthorne.tests/src/test/java/com/io7m/blackthorne/tests/BlackthorneTest.java b/com.io7m.blackthorne.tests/src/test/java/com/io7m/blackthorne/tests/BlackthorneTest.java
index c86a932..1580929 100644
--- a/com.io7m.blackthorne.tests/src/test/java/com/io7m/blackthorne/tests/BlackthorneTest.java
+++ b/com.io7m.blackthorne.tests/src/test/java/com/io7m/blackthorne/tests/BlackthorneTest.java
@@ -22,9 +22,9 @@
 import com.io7m.blackthorne.api.BTElementParsingContextType;
 import com.io7m.blackthorne.api.BTException;
 import com.io7m.blackthorne.api.BTIgnoreUnrecognizedElements;
-import com.io7m.blackthorne.api.BTLeafElementHandler;
 import com.io7m.blackthorne.api.BTParseError;
 import com.io7m.blackthorne.api.BTQualifiedName;
+import com.io7m.blackthorne.api.BTScalarAttributeHandler;
 import com.io7m.blackthorne.api.Blackthorne;
 import com.io7m.blackthorne.jxe.BlackthorneJXE;
 import com.io7m.jxe.core.JXEHardenedSAXParsers;
@@ -1259,7 +1259,7 @@ public void testLeafIntegerAttr0()
     throws Exception
   {
     final var intAttr =
-      new BTLeafElementHandler<>(
+      new BTScalarAttributeHandler<>(
         BTQualifiedName.of("urn:tests", "intA"),
         BlackthorneTest::parseIntAttribute
       );