diff --git a/modules/bindings/pymod/tmtools.py b/modules/bindings/pymod/tmtools.py
index bdc62a06a31e2e3fb5e536b2fa5c1a6f426ad8bb..0d158d77f402012df9fed8edc8692e5a313a51e1 100644
--- a/modules/bindings/pymod/tmtools.py
+++ b/modules/bindings/pymod/tmtools.py
@@ -144,9 +144,9 @@ class TMScoreResult:
The RMSD of the common Calpha atoms of both structures
- .. attribute:: rmsd_below_five
+ .. attribute:: rmsd_below_five
- The RMSD of all Calpha atoms that can be superposed below five Angstroem
+ The RMSD of all Calpha atoms that can be superposed below five Angstroem
.. attribute:: tm_score
diff --git a/modules/db/doc/db.rst b/modules/db/doc/db.rst
index 2333b5aa91875af5724461decb213d18462545ab..a296c1ec6e5db939085a79dab3563841a38c5b39 100644
--- a/modules/db/doc/db.rst
+++ b/modules/db/doc/db.rst
@@ -304,3 +304,89 @@ use an indexer to keep track of where to find data for a certain entry.
:returns: The number of stored positions
:rypte: :class:`int`
+
+Data Extraction
+--------------------------------------------------------------------------------
+
+Openstructure provides data extraction functionality for the following scenario:
+There are three binary container. A position container to hold CA-positions
+(:class:`LinearPositionContainer`), a SEQRES container and
+an ATOMSEQ container (both: :class:`LinearCharacterContainer`).
+They contain entries from the protein structure database
+and sequence/position data is relative to the SEQRES of those entries.
+This means, if the SEQRES has more characters as there are resolved residues
+in the structure, the entry in the position container still contains the exact
+number of SEQRES characters but some position remain invalid. Thats where the
+ATOMSEQ container comes in. It only contains matching residues to the SEQRES but
+marks non-resolved residues with '-'.
+
+.. method:: ExtractValidPositions(entry_name, chain_name, indexer, \
+ atomseq_container, position_container, \
+ seq, positions)
+
+ Iterates over all data for a chain specified by *entry_name* and *chain_name*.
+ For every data point marked as valid in the *atomseq_container* (character at
+ that position is not '-'), the character and the corresponding position are
+ added to *seq* and *positions*
+
+ :param entry_name: Name of assembly you want the data from
+ :param chain_name: Name of chain you want the data from
+ :param indexer: Used to access *atomseq_container* and
+ *position_container*
+ :param atomseq_container: Container that marks locations with invalid position
+ data with '-'
+ :param position_container: Container containing position data
+ :param seq: Sequence with extracted valid positions gets stored
+ in here.
+ :param positions: The extracted valid positions get stored in here
+
+ :type entry_name: :class:`str`
+ :type chain_name: :class:`str`
+ :type indexer: :class:`LinearIndexer`
+ :type atomseq_container: :class:`LinearCharacterContainer`
+ :type position_container: :class:`LinearPositionContainer`
+ :type seq: :class:`ost.seq.SequenceHandle`
+ :type positions: :class:`ost.geom.Vec3List`
+
+ :raises: :exc:`ost.Error` if requested data is not present
+
+
+.. method:: ExtractTemplateData(entry_name, chain_name, aln, indexer, \
+ seqres_container, atomseq_container, \
+ position_container)
+
+ Let's say we have a target-template alignment in *aln* (first seq: target,
+ second seq: template). This function extracts all valid template positions
+ given the entry specified by *entry_name* and *chain_name*. The template
+ sequence in *aln* must match the sequence in *seqres_container*. Again,
+ the *atomseq_container* is used to identify valid positions. The according
+ residue numbers relative to the target sequence in *aln* are also returned.
+
+ :param entry_name: Name of assembly you want the data from
+ :param chain_name: Name of chain you want the data from
+ :param aln: Target-template sequence alignment
+ :param indexer: Used to access *atomseq_container*, *seqres_container*
+ and *position_container*
+ :param seqres_container: Container containing the full sequence data
+ :param atomseq_container: Container that marks locations with invalid position
+ data with '-'
+ :param position_container: Container containing position data
+
+ :type entry_name: :class:`str`
+ :type chain_name: :class:`str`
+ :type aln: :ost.seq.SequenceHandle:
+ :type indexer: :class:`LinearIndexer`
+ :type seqres_container: :class:`LinearCharacterContainer`
+ :type atomseq_container: :class:`LinearCharacterContainer`
+ :type position_container: :class:`LinearPositionContainer`
+
+ :returns: First element: :class:`list` of residue numbers that
+ relate each entry in the second element to the target
+ sequence specified in *aln*. The numbering scheme
+ starts from one. Second Element: :class:`geom.Vec3List`
+ with the according positions.
+ :rtype: :class:`tuple`
+
+ :raises: :exc:`ost.Error` if requested data is not present in
+ the container or if the template sequence in *aln*
+ doesn't match with the sequence in *seqres_container*
diff --git a/modules/index.rst b/modules/index.rst
index 9ab3fdd1ddeaa810a0cfddeaa3c28083c3f22a9c..4b1b1d3c11c7a6b2c0ae585919ebe8479764576f 100644
--- a/modules/index.rst
+++ b/modules/index.rst
@@ -19,6 +19,7 @@ OpenStructure documentation
img/alg/alg
seq/base/seq
seq/alg/seqalg
+ db/db
bindings/bindings
@@ -109,6 +110,8 @@ Varia
**Actions**: :doc:`OST Actions<actions>`
+**Database**: :doc:`Efficiently store structural data<db/db>`
+
Extending OpenStructure
--------------------------------------------------------------------------------