Zip Compress XML Sub-Trees

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VB.NET sample code showing how to Zip compress sub-trees within an XML document.

    ' Zip the contents of each company record.
    Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.Click

        Dim xml As New Chilkat.Xml()
        xml.LoadXmlFile("companies.xml")

        Dim b As Boolean
        b = xml.FirstChild2()
        While (b)
            ' Save the company name as an attribute.
            xml.AddAttribute("name", xml.GetChildContent("name"))

            ' Zip the sub-tree.
            xml.ZipTree()

            b = xml.NextSibling2()
        End While

        xml.GetRoot2()
        xml.SaveXml("zipped.xml")

    End Sub

<?xml version="1.0" encoding="iso-8859-1" ?>
<companies>
    <company>
        <name>Chilkat Software, Inc.</name>
        <address>1719 E Forest Ave</address>
        <city>Wheaton</city>
        <state>IL</state>
        <zip>60187</zip>
        <website>http://www.chilkatsoft.com</website>
        <phone>630-784-9670</phone>
    </company>
    <company>
        <name>Microsoft Corporation</name>
        <address>One Microsoft Way</address>
        <city>Redmond</city>
        <state>WA</state>
        <zip>98052</zip>
        <website>http://www.microsoft.com</website>
        <phone>555-882-8080</phone>
    </company>
    <company>
        <name>Intel Corporation</name>
        <address>2200 Mission College Blvd.</address>
        <city>Santa Clara</city>
        <state>CA</state>
        <zip>95052</zip>
        <website>http://www.intel.com</website>
        <phone>555-765-8080</phone>
    </company>
    <company>
        <name>Adobe Systems Incorporated</name>
        <address>345 Park Avenue</address>
        <city>San Jose</city>
        <state>CA</state>
        <zip>95110</zip>
        <website>http://www.adobe.com</website>
        <phone>555-536-6000</phone>
    </company>
</companies>