diff --git a/lib/core/libimagstore/src/storeid.rs b/lib/core/libimagstore/src/storeid.rs
index b97c4c7f..79fe4e81 100644
--- a/lib/core/libimagstore/src/storeid.rs
+++ b/lib/core/libimagstore/src/storeid.rs
@@ -140,14 +140,17 @@ impl StoreId {
     /// The collection specification _has_ to start with the module name. Otherwise this function
     /// may return false negatives.
     ///
-    pub fn is_in_collection(&self, colls: &[&str]) -> bool {
+    pub fn is_in_collection<S: AsRef<str>, V: AsRef<[S]>>(&self, colls: &V) -> bool {
         use std::path::Component;
 
         self.id
             .components()
-            .zip(colls)
+            .zip(colls.as_ref().iter())
             .map(|(component, pred_coll)| match component {
-                Component::Normal(ref s) => s.to_str().map(|ref s| s == pred_coll).unwrap_or(false),
+                Component::Normal(ref s) => s
+                    .to_str()
+                    .map(|ref s| s == &pred_coll.as_ref())
+                    .unwrap_or(false),
                 _ => false
             })
             .all(|x| x)
diff --git a/lib/entry/libimagentryutil/Cargo.toml b/lib/entry/libimagentryutil/Cargo.toml
index 6d5b9a96..79ad7140 100644
--- a/lib/entry/libimagentryutil/Cargo.toml
+++ b/lib/entry/libimagentryutil/Cargo.toml
@@ -23,6 +23,7 @@ maintenance                       = { status     = "actively-developed" }
 toml = "0.4"
 toml-query = "0.6"
 error-chain = "0.11"
+filters = "0.2"
 
 libimagstore = { version = "0.6.0", path = "../../../lib/core/libimagstore" }
 libimagerror = { version = "0.6.0", path = "../../../lib/core/libimagerror" }
diff --git a/lib/entry/libimagentryutil/src/isincollection.rs b/lib/entry/libimagentryutil/src/isincollection.rs
new file mode 100644
index 00000000..b92d4148
--- /dev/null
+++ b/lib/entry/libimagentryutil/src/isincollection.rs
@@ -0,0 +1,39 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+//
+
+use filters::filter::Filter;
+
+use libimagstore::storeid::StoreId;
+
+pub struct IsInCollection<A: AsRef<str>>(Vec<A>);
+
+impl<A: AsRef<str>> IsInCollection<A> {
+    pub fn new(v: Vec<A>) -> Self {
+        IsInCollection(v)
+    }
+}
+
+impl<A: AsRef<str>> Filter<StoreId> for IsInCollection<A> {
+
+    fn filter(&self, sid: &StoreId) -> bool {
+        sid.is_in_collection(&self.0)
+    }
+
+}
+
diff --git a/lib/entry/libimagentryutil/src/iter.rs b/lib/entry/libimagentryutil/src/iter.rs
new file mode 100644
index 00000000..2289572c
--- /dev/null
+++ b/lib/entry/libimagentryutil/src/iter.rs
@@ -0,0 +1,45 @@
+//
+// imag - the personal information management suite for the commandline
+// Copyright (C) 2015, 2016 Matthias Beyer <mail@beyermatthias.de> and contributors
+//
+// This library is free software; you can redistribute it and/or
+// modify it under the terms of the GNU Lesser General Public
+// License as published by the Free Software Foundation; version
+// 2.1 of the License.
+//
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+// Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public
+// License along with this library; if not, write to the Free Software
+// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+//
+
+use filters::filter::Filter;
+
+pub trait NextWhere<T> {
+    type Item;
+
+    fn next_where<F>(&mut self, f: &F) -> Option<Self::Item>
+        where F: Filter<T>;
+}
+
+impl<T, I> NextWhere<T> for I
+    where I: Iterator<Item = T>
+{
+    type Item = T;
+
+    fn next_where<F>(&mut self, f: &F) -> Option<Self::Item>
+        where F: Filter<T>
+    {
+        while let Some(next) = self.next() {
+            if f.filter(&next) {
+                return Some(next);
+            }
+        }
+        None
+    }
+}
+
diff --git a/lib/entry/libimagentryutil/src/lib.rs b/lib/entry/libimagentryutil/src/lib.rs
index 1298f52f..780ffe76 100644
--- a/lib/entry/libimagentryutil/src/lib.rs
+++ b/lib/entry/libimagentryutil/src/lib.rs
@@ -35,6 +35,7 @@
     while_true,
 )]
 
+extern crate filters;
 extern crate toml;
 extern crate toml_query;
 #[macro_use] extern crate error_chain;
@@ -44,4 +45,6 @@ extern crate libimagerror;
 
 pub mod error;
 pub mod isa;
+pub mod isincollection;
+pub mod iter;