diff --git a/src/main.rs b/src/main.rs
index addb8d3..7f9a0df 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -27,12 +27,8 @@ fn main() {
     let nodes = hosts.iter().map(Host::to_dot_node);
     let edges = hosts.iter().flat_map(Host::to_dot_edge);
 
-    // let edges = ..
-
     //render it
-
-    println!("digraph antennen {{");
-    
+    println!("graph antennen {{");
     for node in nodes {
         println!("{}", node);
     }
@@ -55,15 +51,15 @@ pub enum ParseError {
 
     #[error_chain(custom)]
     #[error_chain(description = r#"|_| "Host file structure broken""#)]
-    #[error_chain(display = r#"|t| write!(f, "the antenna config is wrong: {}", t)"#)]
-    Structure(String),
+    #[error_chain(display = r#"|&(ref name, ref err)| write!(f, "the antenna config of {} is wrong: {}", name, err)"#)]
+    Structure((String, String)),
 }
 
 #[derive(Debug)]
 struct Host {
     name: String,
     ip: String,
-    mac: String,
+    mac: Option<String>,
     kind: HostKind,
 }
 impl Host {
@@ -71,20 +67,24 @@ impl Host {
         RawHost::from_file(path)?.parse()
     }
     fn to_dot_node(&self) -> String {
+        let mac = self.mac.clone().unwrap_or("no mac".into());
         let mut attributes = vec!
             [ "shape=record".to_string()
             , format!("label=\"{{\'{name}\'|{typ}|{{{ip}|{mac}}}|{{{ipv6}}}}}\""
-                , name = self.name, typ=self.kind.name(), ip=self.ip, mac=self.mac, ipv6="no ipv6")
+                , name = self.name, typ=self.kind.name(), ip=self.ip
+                , mac=mac, ipv6="no ipv6")
             , "style=filled".into()
             ];
 
         // type-specific handling
         match self.kind {
-            HostKind::Client {coordinates, ref subnet, .. } => attributes.extend_from_slice(
-                &[ format!("pos=\"{breitengrad},{längengrad}\""
-                    , längengrad=coordinates[0], breitengrad=coordinates[1])
-                , "fillcolor=lightgray".into()
-                ]),
+            HostKind::Client {coordinates, ref subnet, .. } =>
+                { attributes.push("fillcolor=lightgray".into())
+                ; if let Some(coordinates) = coordinates
+                    { attributes.push(format!("pos=\"{breitengrad},{längengrad}\""
+                        , längengrad=coordinates[0], breitengrad=coordinates[1]))
+                    }
+                },
             _ => (),
         };
 
@@ -95,7 +95,7 @@ impl Host {
     fn to_dot_edge(&self) -> Option<String> {
         match self.kind {
             HostKind::Client { ref parent, .. } =>
-                format!("\"{name}\" -> \"{parent}\"", name=self.name, parent=parent).into(),
+                format!("\"{name}\" -- \"{parent}\"", name=self.name, parent=parent).into(),
             _ => None,
         }
     }
@@ -103,7 +103,7 @@ impl Host {
 
 #[derive(Debug)]
 enum HostKind {
-    Client { subnet: String, coordinates: [f64;2], parent: String },
+    Client { subnet: String, coordinates: Option<[f64;2]>, parent: String },
     AccessPoint,
     Other,
 }
@@ -127,7 +127,7 @@ struct RawHost {
     ansible_host: String,
     #[serde(rename = "type")]
     kind: String,
-    mac: String,
+    mac: Option<String>,
     client_of: Option<String>,
     coordinate: Option<[f64;2]>,
     subnet: Option<String>,
@@ -135,21 +135,22 @@ struct RawHost {
 
 impl RawHost {
     fn parse(self) -> Result<Host> {
-        let name = self.name
-            .ok_or(ParseError::Structure("got no file name? weird.".into()))?
+        let name : String = self.name
+            .ok_or(ParseError::Structure(("???".into(),"got no file name? weird.".into())))?
             .into_string().unwrap()
             .split('.')
             .next().unwrap().into();
         Ok(Host
-            { name: name
+            { name: name.clone()
             , ip: self.ansible_host
             , mac: self.mac
             , kind: match self.kind.as_ref()
                 { "wlan-ap" => HostKind::AccessPoint
                 , "client" => HostKind::Client
-                    { subnet: self.subnet.ok_or(ParseError::Structure("is client, has no subnet".into()))?
-                    , coordinates: self.coordinate.ok_or(ParseError::Structure("is client, has no coordinates".into()))?
-                    , parent: self.client_of.ok_or(ParseError::Structure("is client, has no client_of".into()))?
+                    { subnet: self.subnet.ok_or(ParseError::Structure((name.clone(), "is client, has no subnet".into())))?
+                    //, coordinates: self.coordinate.ok_or(ParseError::Structure("is client, has no coordinates".into()))?
+                    , coordinates: self.coordinate
+                    , parent: self.client_of.ok_or(ParseError::Structure((name.clone(), "is client, has no client_of".into())))?
                     }
                 , _ => HostKind::Other
                 }