Determine what are the formatting elements available in `desc`

[charlesriondet]

I think that we should allow users to

• make (nested) lists:

<list>
   <item></item>
   <item>
       <list>
            <item></item>
            <item></item>
     </list>
   </item>
</list>

• Create links

`

`

[charlesriondet]

Example for list

<desc xml:lang="en" type="definition">
                        <list>
                            <item>Scanning system
                            <list>
                                <item>Triangulation based artefact scanners</item>
                                <item>Terrestrial time of flight laser scanners</item>
                                <item>Airborne laser scanning</item>
                                <item>Mobile Mapping systems</item>
                            </list>
                        </item>
                            <item>Methodological framework
                                <list>
                                    <item>Data acquisition</item>
                                    <item>Register scan</item>
                                    <item>Georeference scan</item>
                                    <item>Creation polygonal mesh</item>
                                    <item>Optimization/Decimation mesh</item>
                                </list>
                            </item>
                        </list> 
                    </desc>