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      <Link to="Hypothesis" name="based_on_hypothesis" arity=""/>
      <Group type="Group" name="Treatment" x="0" y="32">
        <Link to="Sample" name="sample" arity="one"/>
        <Link to="Method" name="treatment_method" arity=""/>
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      <Group type="Group" name="sampling" x="0" y="93">
        <Link to="Sample" name="observed_sample" arity="one"/>
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      <File type="File" name="observed_data" arity="many"/>
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      <Link to="Analysis" name="analysed_analysis" arity="many"/>
      <Link to="Observation" name="analysed_result" arity="many"/>
      <Comment>this is another comment</Comment>
      <File type="File" name="analysed_data" arity="many"/>
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      <Attribute type="Text" name="Hypothetical Description"/>
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      <Attribute type="Text" name="Method description"/>
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      <Link to="Hypothesis" name="idea" arity="many"/>
      <Comment>a &lt;b&gt;study&lt;/b&gt; is an interrinteting thing</Comment>
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  <RootItemTypeList>
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