Put template:

<VegBIEN>

    <_simplifyPath id="-1">

        <next>parent_id</next>

        <path>

            <location>

                <locationevent>

                    <taxonoccurrence>

                        <aggregateoccurrence>

                            <cover_fraction><_percent_to_fraction><value>$cover</value></_percent_to_fraction></cover_fraction>

                            <sourceaccessioncode>$taxonimportance_id</sourceaccessioncode>

                        </aggregateoccurrence>

                        <sourceaccessioncode>$taxonobservation_id</sourceaccessioncode>

                    </taxonoccurrence>

                </locationevent>

            </location>

        </path>

    </_simplifyPath>

</VegBIEN>