diff --git a/docs/_static/documentation_options.js b/docs/_static/documentation_options.js
index 9872a6c3..915cbfe8 100644
--- a/docs/_static/documentation_options.js
+++ b/docs/_static/documentation_options.js
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diff --git a/docs/about.html b/docs/about.html
index 2ee4a4d4..0d8df7dd 100644
--- a/docs/about.html
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@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>3. About BioSimulators utils &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>3. About BioSimulators utils &#8212; BioSimulators utils 0.1.27 documentation</title>
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@@ -140,7 +140,7 @@ <h2><span class="section-number">3.5. </span>Questions and comments<a class="hea
     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="_sources/about.rst.txt"
diff --git a/docs/genindex.html b/docs/genindex.html
index 1053381a..6140fe9a 100644
--- a/docs/genindex.html
+++ b/docs/genindex.html
@@ -5,7 +5,7 @@
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Index &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>Index &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <link rel="stylesheet" href="_static/alabaster.css" type="text/css" />
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@@ -1860,7 +1860,7 @@ <h2 id="Z">Z</h2>
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   </div>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
     </div>
 
diff --git a/docs/index.html b/docs/index.html
index 8f5d55a6..cdd28ab6 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -5,7 +5,7 @@
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>BioSimulators utils documentation &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>BioSimulators utils documentation &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <link rel="stylesheet" href="_static/alabaster.css" type="text/css" />
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@@ -158,7 +158,7 @@ <h2>Contents<a class="headerlink" href="#contents" title="Permalink to this head
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     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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diff --git a/docs/installation.html b/docs/installation.html
index 0d26ed60..bf44989d 100644
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+++ b/docs/installation.html
@@ -5,7 +5,7 @@
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>1. Installation instructions &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>1. Installation instructions &#8212; BioSimulators utils 0.1.27 documentation</title>
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@@ -131,7 +131,7 @@ <h2><span class="section-number">1.2. </span>Installing the latest revision from
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   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="_sources/installation.rst.txt"
diff --git a/docs/py-modindex.html b/docs/py-modindex.html
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@@ -5,7 +5,7 @@
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Python Module Index &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>Python Module Index &#8212; BioSimulators utils 0.1.27 documentation</title>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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diff --git a/docs/search.html b/docs/search.html
index 1a7cb3e4..66f1a67b 100644
--- a/docs/search.html
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@@ -5,7 +5,7 @@
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     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>Search &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>Search &#8212; BioSimulators utils 0.1.27 documentation</title>
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@@ -121,7 +121,7 @@ <h1 id="search-documentation">Search</h1>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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index e9e43941..e7543af2 100644
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     <meta charset="utf-8" />
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-    <title>2.1.1. biosimulators_utils.archive package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.1. biosimulators_utils.archive package &#8212; BioSimulators utils 0.1.27 documentation</title>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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index 8ee7a664..d6cedd26 100644
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-    <title>2.1.2. biosimulators_utils.biosimulations package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.2. biosimulators_utils.biosimulations package &#8212; BioSimulators utils 0.1.27 documentation</title>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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     <meta charset="utf-8" />
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-    <title>2.1.3. biosimulators_utils.combine package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.3. biosimulators_utils.combine package &#8212; BioSimulators utils 0.1.27 documentation</title>
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   </div>
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-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
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diff --git a/docs/source/biosimulators_utils.exec_status.html b/docs/source/biosimulators_utils.exec_status.html
index e56b098a..8a7df323 100644
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-    <title>2.1.4. biosimulators_utils.exec_status package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.4. biosimulators_utils.exec_status package &#8212; BioSimulators utils 0.1.27 documentation</title>
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   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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index 5410cb3d..f9c140fa 100644
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-    <title>2.1.5. biosimulators_utils.gh_action package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.5. biosimulators_utils.gh_action package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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index c768b9ee..d16777ee 100644
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     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>2. biosimulators_utils package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2. biosimulators_utils package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
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diff --git a/docs/source/biosimulators_utils.kisao.html b/docs/source/biosimulators_utils.kisao.html
index ba3b77f2..2e599755 100644
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-    <title>2.1.6. biosimulators_utils.kisao package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.6. biosimulators_utils.kisao package &#8212; BioSimulators utils 0.1.27 documentation</title>
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   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
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diff --git a/docs/source/biosimulators_utils.plot.html b/docs/source/biosimulators_utils.plot.html
index f38a3972..b858fb69 100644
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-    <title>2.1.7. biosimulators_utils.plot package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.7. biosimulators_utils.plot package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.plot.rst.txt"
diff --git a/docs/source/biosimulators_utils.report.html b/docs/source/biosimulators_utils.report.html
index d698aa4f..0a8c7014 100644
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+++ b/docs/source/biosimulators_utils.report.html
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>2.1.8. biosimulators_utils.report package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.8. biosimulators_utils.report package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
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diff --git a/docs/source/biosimulators_utils.sedml.html b/docs/source/biosimulators_utils.sedml.html
index 16140763..ef541ac8 100644
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+++ b/docs/source/biosimulators_utils.sedml.html
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-    <title>2.1.9. biosimulators_utils.sedml package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.9. biosimulators_utils.sedml package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.sedml.rst.txt"
diff --git a/docs/source/biosimulators_utils.simulator.html b/docs/source/biosimulators_utils.simulator.html
index 08c7fcfd..6f1409ce 100644
--- a/docs/source/biosimulators_utils.simulator.html
+++ b/docs/source/biosimulators_utils.simulator.html
@@ -5,7 +5,7 @@
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     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>2.1.10. biosimulators_utils.simulator package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.10. biosimulators_utils.simulator package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.simulator.rst.txt"
diff --git a/docs/source/biosimulators_utils.simulator_registry.html b/docs/source/biosimulators_utils.simulator_registry.html
index 9ce6a087..0a859a49 100644
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+++ b/docs/source/biosimulators_utils.simulator_registry.html
@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>2.1.11. biosimulators_utils.simulator_registry package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.11. biosimulators_utils.simulator_registry package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.simulator_registry.rst.txt"
diff --git a/docs/source/biosimulators_utils.utils.html b/docs/source/biosimulators_utils.utils.html
index 7e1de52e..523a90c9 100644
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+++ b/docs/source/biosimulators_utils.utils.html
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-    <title>2.1.12. biosimulators_utils.utils package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.12. biosimulators_utils.utils package &#8212; BioSimulators utils 0.1.27 documentation</title>
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     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.utils.rst.txt"
diff --git a/docs/source/biosimulators_utils.xml.html b/docs/source/biosimulators_utils.xml.html
index b1531e29..125df8b3 100644
--- a/docs/source/biosimulators_utils.xml.html
+++ b/docs/source/biosimulators_utils.xml.html
@@ -5,7 +5,7 @@
   <head>
     <meta charset="utf-8" />
     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
-    <title>2.1.13. biosimulators_utils.xml package &#8212; BioSimulators utils 0.1.26 documentation</title>
+    <title>2.1.13. biosimulators_utils.xml package &#8212; BioSimulators utils 0.1.27 documentation</title>
     <link rel="stylesheet" href="../_static/pygments.css" type="text/css" />
     <link rel="stylesheet" href="../_static/alabaster.css" type="text/css" />
     <script id="documentation_options" data-url_root="../" src="../_static/documentation_options.js"></script>
@@ -158,7 +158,7 @@ <h2><span class="section-number">2.1.13.1. </span>Submodules<a class="headerlink
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>filename</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code>) – path to XML file</p></li>
 <li><p><strong>x_paths</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">list</span></code> of <cite>str</cite>) – XPaths</p></li>
-<li><p><strong>attr</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code>, optional) – attribute to get values of</p></li>
+<li><p><strong>attr</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code> or <code class="xref py py-obj docutils literal notranslate"><span class="pre">dict</span></code>, optional) – attribute to get values of</p></li>
 </ul>
 </dd>
 <dt class="field-even">Returns</dt>
@@ -183,7 +183,7 @@ <h2><span class="section-number">2.1.13.1. </span>Submodules<a class="headerlink
 <dd class="field-odd"><ul class="simple">
 <li><p><strong>filename</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code>) – path to XML file</p></li>
 <li><p><strong>x_paths</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">list</span></code> of <cite>str</cite>) – XPaths</p></li>
-<li><p><strong>attr</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code>, optional) – attribute to get values of</p></li>
+<li><p><strong>attr</strong> (<code class="xref py py-obj docutils literal notranslate"><span class="pre">str</span></code> or <code class="xref py py-obj docutils literal notranslate"><span class="pre">dict</span></code>, optional) – attribute to get values of</p></li>
 </ul>
 </dd>
 <dt class="field-even">Returns</dt>
@@ -213,7 +213,7 @@ <h2><span class="section-number">2.1.13.1. </span>Submodules<a class="headerlink
     <div class="clearer"></div>
   </div>
     <div class="footer">
-      &copy;2020, BioSimulators Team.
+      &copy;2021, BioSimulators Team.
       
       |
       <a href="../_sources/source/biosimulators_utils.xml.rst.txt"
