diff -Nru python-biopython-1.70+dfsg/debian/changelog python-biopython-1.70+dfsg/debian/changelog
--- python-biopython-1.70+dfsg/debian/changelog	2017-11-07 12:24:21.000000000 +0000
+++ python-biopython-1.70+dfsg/debian/changelog	2017-12-19 10:07:47.000000000 +0000
@@ -1,3 +1,11 @@
+python-biopython (1.70+dfsg-4) unstable; urgency=medium
+
+  * Symlink to mathml2.dtd of w3-dtd-mathml package
+    Closes: #672407
+  * Standards-Version: 4.1.2
+
+ -- Andreas Tille <tille@debian.org>  Tue, 19 Dec 2017 11:07:47 +0100
+
 python-biopython (1.70+dfsg-3) unstable; urgency=medium
 
   * Copy *.rst doc files.
diff -Nru python-biopython-1.70+dfsg/debian/control python-biopython-1.70+dfsg/debian/control
--- python-biopython-1.70+dfsg/debian/control	2017-11-07 12:19:32.000000000 +0000
+++ python-biopython-1.70+dfsg/debian/control	2017-12-19 10:07:47.000000000 +0000
@@ -49,7 +49,7 @@
                raxml [any-amd64],
                t-coffee,
                wise (>= 2.4.1-16)
-Standards-Version: 4.1.1
+Standards-Version: 4.1.2
 Vcs-Browser: https://anonscm.debian.org/cgit/debian-med/python-biopython.git
 Vcs-Git: https://anonscm.debian.org/git/debian-med/python-biopython.git
 Homepage: http://biopython.org
@@ -89,7 +89,8 @@
           raxml,
           samtools,
           t-coffee,
-          wise (>= 2.4.1-16)
+          wise (>= 2.4.1-16),
+          w3-dtd-mathml
 Description: Python library for bioinformatics (implemented in Python 2)
  The Biopython Project is an international association
  of developers of freely available Python tools for
@@ -140,7 +141,8 @@
           raxml,
           samtools,
           t-coffee,
-          wise (>= 2.4.1-16)
+          wise (>= 2.4.1-16),
+          w3-dtd-mathml
 Description: Python library for bioinformatics (implemented in Python 3)
  The Biopython Project is an international association
  of developers of freely available Python tools for
diff -Nru python-biopython-1.70+dfsg/debian/copyright python-biopython-1.70+dfsg/debian/copyright
--- python-biopython-1.70+dfsg/debian/copyright	2016-03-09 11:44:10.000000000 +0000
+++ python-biopython-1.70+dfsg/debian/copyright	2017-12-19 10:07:47.000000000 +0000
@@ -1,4 +1,4 @@
-Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: Biopython
 Upstream-Contact: https://github.com/biopython/biopython/issues
                   Biopython discussion list <biopython@lists.open-bio.org>
diff -Nru python-biopython-1.70+dfsg/debian/python3-biopython.links python-biopython-1.70+dfsg/debian/python3-biopython.links
--- python-biopython-1.70+dfsg/debian/python3-biopython.links	1970-01-01 00:00:00.000000000 +0000
+++ python-biopython-1.70+dfsg/debian/python3-biopython.links	2017-12-19 10:07:47.000000000 +0000
@@ -0,0 +1 @@
+/usr/share/xml/schema/w3c/mathml/dtd/mathml2.dtd	/usr/lib/python3/dist-packages/Bio/Entrez/DTDs/mathml2.dtd
diff -Nru python-biopython-1.70+dfsg/debian/python-biopython.links python-biopython-1.70+dfsg/debian/python-biopython.links
--- python-biopython-1.70+dfsg/debian/python-biopython.links	1970-01-01 00:00:00.000000000 +0000
+++ python-biopython-1.70+dfsg/debian/python-biopython.links	2017-12-19 10:07:47.000000000 +0000
@@ -0,0 +1 @@
+/usr/share/xml/schema/w3c/mathml/dtd/mathml2.dtd	/usr/lib/python2.7/dist-packages/Bio/Entrez/DTDs/mathml2.dtd