the problem of parsing angle brackets(<>) after transferred by ckeditor

[aang]

1.the version of my ckeditor is ckeditor_4.3.4_full;
2.when I put some angle brackets(<>) in textarea, the ckeditor cannot parse it if there are not a blank space around it.

example:
(1) nothing happened in ckeditor.
<textarea name="editor1" id="editor1">
<p>&lt;hello!&gt;</p>
</textarea>

(2)will be showed correctly.(notice the space around hello!)
<textarea name="editor1" id="editor1">
<p>&lt; hello! &gt;</p>
</textarea>

[Piotrek Koszuliński]

When you have in your page:

<textarea name="editor1" id="editor1">
<p>&lt;hello!&gt;</p>
</textarea>

The browser says that the value of textarea is:

<p><hello!></p>

As you can see - it's an invalid HTML. Therefore CKEditor cannot load it. To prevent that you need to encode entire editor content before passing it to HTML:

<textarea name="editor1" id="editor1">
&lt;p&gt;&amp;lt;hello!&amp;gt;&lt;/p&gt;
</textarea>