这是我的xml文件。我想更新它。什么是更新此xml文件的最简单方法。任何节点值，如电影标签中的视频文件，标题标签中的标题等。
<?xml version="1.0"?>
<gallerylist>
<record>
<movie>videos/Avatar_HD.flv</movie>
<title>Title:</title>
<desc>Description</desc>
<preview>videos/previews/avatar.jpg</preview>
<imgplaylist>videos/imgplaylist/p1.jpg</imgplaylist>
<category>Category</category>
</record>
<record>
<movie>videos/The_Princess_And_The_Frog_HD.flv</movie>
<title></title>
<desc>fdgdd</desc>
<preview>videos/previews/frog.jpg</preview>
<imgplaylist>videos/imgplaylist/p4.jpg</imgplaylist>
<category>Category1</category>
</record>
<record>
<movie>videos/Prince_of_Persia_The_Sands_of_Time_HD.flv</movie>
<title>Title:2</title>
<desc>xzcXZ</desc>
<preview>videos/previews/sandsoftime.jpg</preview>
<imgplaylist>videos/imgplaylist/p2.jpg</imgplaylist>
<category>Category2</category>
</record>
<record>
<movie>videos/Sherlock_Holmes_HD.flv</movie>
<title>Title:4</title>
<desc>dfgdf</desc>
<preview>videos/previews/sherlock.jpg</preview>
<imgplaylist>videos/imgplaylist/p7.jpg</imgplaylist>
<category>Category4</category>
</record>
</gallerylist>