<comment>url in case of custom navigation link</comment>
<add>3.0</add>
</field>
+ <field>
+ <name>icon</name>
+ <title>Icon</title>
+ <type>varchar</type>
+ <length>255</length>
+ <comment>CSS class name for an icon</comment>
+ <default>NULL</default>
+ <required>false</required>
+ <add>4.7</add>
+ </field>
<field>
<name>permission</name>
<title>Required Permission</title>