title: How can I populate Liquibase parameter values from an external properties file?
body: <p>Is there any way that I can populate <a href="http://www.liquibase.org/documentation/changelog_parameters.html" rel="nofollow">parameters</a> in a Liquibase changelog file based on the contents of an external property file?</p>
  
  <p>As in, I would like to be able to say:
  </p>
  
  <pre><code>&lt;createTable tableName="${table.name}"&gt;
       &lt;column name="id" type="int"/&gt;
       &lt;column name="${column1.name}" type="varchar(${column1.length})"/&gt;
       &lt;column name="${column2.name}" type="int"/&gt;
  &lt;/createTable&gt;
  </code></pre>
  
  <p>And keep the value of <code>table.name</code> and the other parameters in an external file <code>db.properties</code>, and reference this file either from within the changelog, or from the Liquibase command line, or as an option of the Maven plugin that runs liquibase.</p>
  
  <p>I can't seem to find any way to do this, is it possible?</p>