ip=<uci:value       src="network.lan.ipaddr"   />
ip=<uci:value src="network.@interface[-1].ipaddr         "/>
ip=<uci:value src="network.@interface[-1].fail"         default="foo"/>

<uci:foreach src="network" type="interface" id="net" >
        ip=<uci:value src=".ipaddr" ref="net"   />
        ip=<uci:value src=".ipaddr" ref="foo" default="abc"/>
        ip=<uci:value src=".ipaddr"/>
</uci:foreach>

sss

<uci:foreach src="network" type="interface" id="net">
        username=<uci:value src=".username" def="foo"/>
        password=<uci:value src=".passwd" def="bar"/>
</uci:foreach>

  a
<!foooooi>
b
<uci:foreach src="network" type="interface" id="net">
        <uci:if src=".proto" match="dhcp">
                proto = dhcp
        </uci:if>
        <uci:if src=".proto" match="!dhcp">
                proto != dhcp
        </uci:if>
        <uci:if src=".proto" match="dhcp|static">
                proto == dhcp || proto == static
        </uci:if>
        <uci:if src=".proto" match="!dhcp&!static">
                proto != dhcp && proto != static
        </uci:if>
</uci:foreach>