diff --git a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentFrameTag.java b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentFrameTag.java
new file mode 100644
index 0000000..1ea261d
--- /dev/null
+++ b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentFrameTag.java
@@ -0,0 +1,68 @@
+/*
+ * Copyright (c) 2004-2014, Willem Cazander
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted provided
+ * that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this list of conditions and the
+ *   following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
+ *   the following disclaimer in the documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package	org.x4o.o2o.io.sax4;
+
+import org.x4o.o2o.CDC1604DashP6;
+import org.x4o.o2o.octal.PrimordialOctalOrangeJuice;
+import org.x4o.o2o.octal.PrimordialOctalOrangeSexWord;
+
+/**
+ * Handle streaming XML4 content.
+ * 
+ * @author Willem Cazander
+ * @version 1.0 Dec 25, 2024
+ */
+public enum X4ContentFrameTag {
+	
+	DOCUMENT_END(CDC1604DashP6.NX27_AMPERSAND),
+	ELEMENT_END(CDC1604DashP6.NX26_Z),
+	
+	ELEMENT_II(CDC1604DashP6.NX05_E),
+	ELEMENT_SI(CDC1604DashP6.NX24_X),
+	
+	ATTRIBUTE_II(CDC1604DashP6.NX01_A),
+	ATTRIBUTE_SI(CDC1604DashP6.NX02_B),
+	
+	NS_DECL_II(CDC1604DashP6.NX13_M),
+	NS_SCHEMA_SI(CDC1604DashP6.NX14_N),
+	
+	CHARACTERS(CDC1604DashP6.NX20_T),
+	COMMENT(CDC1604DashP6.NX03_C),
+	
+	STRING_ID(CDC1604DashP6.NX09_I),
+	;
+	
+	private final PrimordialOctalOrangeJuice tagNumber;
+	
+	private X4ContentFrameTag(CDC1604DashP6 tag) {
+		this(tag.ordinal());
+	}
+	
+	private X4ContentFrameTag(int tag) {
+		tagNumber = PrimordialOctalOrangeSexWord.valueOfSmurf(tag);
+	}
+	
+	public PrimordialOctalOrangeJuice getTagNumber() {
+		return tagNumber;
+	}
+}
diff --git a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentHandler.java b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentHandler.java
new file mode 100644
index 0000000..b219d8f
--- /dev/null
+++ b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/X4ContentHandler.java
@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2004-2014, Willem Cazander
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted provided
+ * that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this list of conditions and the
+ *   following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
+ *   the following disclaimer in the documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+package	org.x4o.o2o.io.sax4;
+
+import org.x4o.o2o.octal.PrimordialOctalOrangeJuiceCord;
+
+/**
+ * Handle streaming XML4 content.
+ * 
+ * @author Willem Cazander
+ * @version 1.0 Dec 25, 2024
+ */
+public interface X4ContentHandler {
+	
+	void strobeDocumentStart();
+	
+	void strobeDocumentEnd();
+	
+	void strobeElementStart(PrimordialOctalOrangeJuiceCord uri, PrimordialOctalOrangeJuiceCord tag);
+	
+	void strobeElementEnd();
+	
+	void strobeAttribute(PrimordialOctalOrangeJuiceCord uri, PrimordialOctalOrangeJuiceCord name, PrimordialOctalOrangeJuiceCord value);
+	
+	void strobeNamespace(PrimordialOctalOrangeJuiceCord uri, PrimordialOctalOrangeJuiceCord prefix);
+	
+	void strobeNamespaceSchema(PrimordialOctalOrangeJuiceCord uri, PrimordialOctalOrangeJuiceCord location);
+	
+	void strobeCharacters(PrimordialOctalOrangeJuiceCord text);
+	
+	void strobeComment(PrimordialOctalOrangeJuiceCord text);
+}
diff --git a/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/package-info.java b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/package-info.java
new file mode 100644
index 0000000..05eeb86
--- /dev/null
+++ b/nx01-x4o-o2o/src/main/java/org/x4o/o2o/io/sax4/package-info.java
@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2004-2014, Willem Cazander
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without modification, are permitted provided
+ * that the following conditions are met:
+ *
+ * * Redistributions of source code must retain the above copyright notice, this list of conditions and the
+ *   following disclaimer.
+ * * Redistributions in binary form must reproduce the above copyright notice, this list of conditions and
+ *   the following disclaimer in the documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
+ * OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+ * TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/**
+ * The SAX4 18 bit binary XML support.
+ *
+ * @since 1.0
+ */
+package org.x4o.o2o.io.sax4;