Symbol sym1 {
    typeID = "Router"
}

Symbol sym2 {
    typeID = "PC"
}

Symbol sym3 {
    typeID = "PC"
}

Attribute att1 {
    key = "IP"
    value = "192.168.0.1"
}

SymbolAttribute(sym1, att1) {}
Link(sym1, sym2) {}
Link(sym1, sym3) {}