Subject: [PATCH 01/20] container element for structure tree

---
 .../apache/fop/accessibility/StructureElement.java |  115 ++++++++++++++++++++
 1 files changed, 115 insertions(+), 0 deletions(-)
 create mode 100644 src/java/org/apache/fop/accessibility/StructureElement.java

diff --git a/src/java/org/apache/fop/accessibility/StructureElement.java b/src/java/org/apache/fop/accessibility/StructureElement.java
new file mode 100644
index 0000000..f74d06b
--- /dev/null
+++ b/src/java/org/apache/fop/accessibility/StructureElement.java
@@ -0,0 +1,115 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements.  See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License.  You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/* $Id:  $ */
+
+package org.apache.fop.accessibility;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.xml.sax.ContentHandler;
+import org.xml.sax.SAXException;
+import org.xml.sax.helpers.AttributesImpl;
+
+import org.apache.fop.util.XMLUtil;
+
+/**
+ * A reduced version of the document's FO tree element, containing only its logical
+ * structure. Used by accessible output formats.
+ */
+public final class StructureElement {
+
+    private static final String FO = "http://www.w3.org/1999/XSL/Format";
+    private static final String FOX = "http://xmlgraphics.apache.org/fop/extensions";
+    private static final String FOI = "http://xmlgraphics.apache.org/fop/internal";
+
+    protected String name;
+    protected String ptr;
+    protected String role;
+    protected String alttext;
+
+    protected List children;
+
+    public StructureElement(String name) {
+        this.name = name;
+        children = new ArrayList();
+    }
+
+    public void setName(String name) {
+        this.name = name;
+    }
+
+    public void setPtr(String ptr) {
+        this.ptr = ptr;
+    }
+
+    public void setRole(String role) {
+        if ("none".equals(role))
+            this.role = null;
+        else
+            this.role = role;
+    }
+
+    public void setAltText(String alttext) {
+        this.alttext = alttext;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public String getPtr() {
+        return ptr;
+    }
+
+    public String getRole() {
+        return role;
+    }
+    
+    public String getAltText() {
+        return alttext;
+    }
+
+    public int getLength() {
+        return children.size();
+    }
+
+    public void addChild(StructureElement e) {
+        children.add(e);
+    }
+
+    public StructureElement getChild(int i) {
+        return (StructureElement)children.get(i);
+    }
+
+    public void toXML(ContentHandler handler) throws SAXException {
+        AttributesImpl atts = new AttributesImpl();
+        if (ptr != null)
+            atts.addAttribute(FOI, "ptr", "foi:ptr", XMLUtil.CDATA, ptr);
+        if (role != null)
+            atts.addAttribute(FO, "role", "fo:role", XMLUtil.CDATA, role);
+        if (alttext != null)
+            atts.addAttribute(FOX, "alt-text", "fox:alt-text", XMLUtil.CDATA, alttext);
+
+        handler.startElement(FO, name, "fo:"+name, atts);
+        for(int i=0;i<children.size();i++)
+            ((StructureElement)children.get(i)).toXML(handler);
+        handler.endElement(FO, name, "fo:"+name);
+    }
+
+}
-- 
1.6.4.2