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Dynamic variables can be also assigned from a value in configuration files with key-value pairs, as property files.

The attribute type="options" is to be used to make this file parsed as an option file. Separators between the key and value might be for instance '=', ':' including their escaped variants '\=', '\:', where leading and trailing whitespaces are trimmed off.

Example:

<dynamicvariables>
    <variable name="option.1" checkonce="true"
              file="${INSTALL_PATH}/../old_installation/test.properties" type="options"
              key="first.setting"/>
    <variable name="option.2" checkonce="true"
              file="${INSTALL_PATH}/../old_installation/test.conf" type="options"
              key="work.dir"/>
</dynamicvariables>

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