fixed issue with datafile block

Author: habibasorour

source/ch8_filehandling.ptx

@@ -340,9 +340,10 @@ public class CreateFile {
         <p>
             And that's it! We will add our code to the foundational code for a complete program. First, <xref ref="file-write-full-python" text="type-global"/> shows the completed Python code.
         </p>
-        <data xml:id="data-file-write-full-python">
+
+        <data xml:id="listing-data-file-write-full-python">
             <title>Data file for writing example</title>
-        <datafile label="data-file-write-full-python" filename="myfile.txt" editable="yes">
+        <datafile xml:id="data-file-write-full-python" label="data-file-write-full-python" filename="myfile.txt" editable="yes">
                 <pre>
 
                 </pre>
@@ -367,9 +368,9 @@ public class CreateFile {
         <p>
            <xref ref="file-write-full-java" text="type-global"/> shows the completed Java code. 
         </p>
-        <data xml:id="data-file-write-full-java">
+        <data xml:id="listing-data-file-write-full-java">
             <title>Data file for writing example</title>
-        <datafile label="data-file-write-full-java" filename="myfile.txt" editable="yes">
+        <datafile xml:id="data-file-write-full-java" label="data-file-write-full-java" filename="myfile.txt" editable="yes">
                 <pre>
 
                 </pre>
@@ -395,7 +396,7 @@ public class CreateFile {
                     }
                 }
             }
-            </code> 
+            </code> ~
         </program>
         </listing>
 
@@ -420,9 +421,9 @@ public class CreateFile {
             Now, when we use <c>write()</c> method like before, the text will be appended if there is already tSext in the document. If we were to update our code to include the <c>boolean</c> argument as shown in <xref ref="file-write-with-append" text="type-global"/>. 
         </p>
 
-        <data xml:id="data-file-write-with-append">
+        <data xml:id="listing-data-file-write-with-append">
             <title>Data file for writing example</title>
-        <datafile label="data-file-write-with-append" filename="myfile" editable="yes">
+        <datafile xml:id="data-file-write-with-append" label="data-file-write-with-append" filename="myfile" editable="yes">
                 <pre>
 
                 </pre>
@@ -467,7 +468,7 @@ public class CreateFile {
         </p>
 
         <listing xml:id="file-write-with-newline">
-        <program  language="java">
+        <program language="java">
             myWriter.write("File successfully updated!\n"); // Added newline character 
             myWriter.close(); 
         </program>