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diff --git a/src/event.rs b/src/event.rs
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+// Copyright 2015 Till Höppner
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//    http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//! Common structures to represent the actual log data in memory.
+//! These will be used by all formats for encoding and decoding.
+
+use std::borrow::Cow;
+
+use chrono::offset::fixed::FixedOffset;
+use chrono::offset::TimeZone;
+use chrono::datetime::DateTime;
+
+use context::Context;
+
+/// A whole log, in memory. This structure does not specify its
+/// use. It may represent a private query, or the log of a channel.
+pub struct Log<'a> {
+    pub entries: Vec<Event<'a>>
+}
+
+/// Different log formats carry different amounts of information. Some might
+/// hold enough information to calculate precise timestamps, others might
+/// only suffice for the time of day.
+#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
+pub enum Time {
+    Unknown,
+    Hms(u8, u8, u8),
+    Timestamp(i64)
+}
+
+impl Time {
+    pub fn from_format(tz: &FixedOffset, s: &str, f: &str) -> Time {
+        tz.datetime_from_str(s, f)
+            .map(|d| d.timestamp())
+            .map(Time::Timestamp)
+            .unwrap_or(Time::Unknown)
+    }
+
+    pub fn with_format(&self, tz: &FixedOffset, f: &str) -> String {
+        match self {
+            &Time::Unknown => panic!("Time data for this event is not present"),
+            &Time::Hms(h, m, s) => unimplemented!(),
+            &Time::Timestamp(t) => format!("{}", tz.timestamp(t, 0).format(f))
+        }
+    }
+}
+
+#[derive(Clone, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
+pub struct Event<'a> {
+    pub ty: Type<'a>,
+    pub time: Time,
+    pub channel: Option<Cow<'a, str>>
+}
+
+/// All representable events, such as messages, quits, joins
+/// and topic changes.
+#[derive(Clone, Debug, Hash, PartialEq, RustcEncodable, RustcDecodable)]
+pub enum Type<'a> {
+    Connect,
+    Disconnect,
+    Msg {
+        from: Cow<'a, str>,
+        content: Cow<'a, str>,
+    },
+    Action {
+        from: Cow<'a, str>,
+        content: Cow<'a, str>,
+    },
+    Join {
+        nick: Cow<'a, str>,
+        mask: Option<Cow<'a, str>>,
+    },
+    Part {
+        nick: Cow<'a, str>,
+        mask: Option<Cow<'a, str>>,
+        reason: Option<Cow<'a, str>>,
+    },
+    Quit {
+        nick: Cow<'a, str>,
+        mask: Option<Cow<'a, str>>,
+        reason: Option<Cow<'a, str>>,
+    },
+    Nick {
+        old_nick: Cow<'a, str>,
+        new_nick: Cow<'a, str>,
+    },
+    Notice {
+        from: Cow<'a, str>,
+        content: Cow<'a, str>,
+    },
+    Kick {
+        kicked_nick: Cow<'a, str>,
+        kicking_nick: Option<Cow<'a, str>>,
+        kick_message: Option<Cow<'a, str>>,
+    },
+    Topic {
+        topic: Cow<'a, str>,
+    },
+    TopicChange {
+        new_topic: Cow<'a, str>,
+    },
+    Mode
+}