modules/custom/eml_harvest_list/templates/eml-hl--node--data-set.tpl.php
<document>
<docid>
<scope><?php print 'knb-lter-' . strtolower($station); ?></scope>
<identifier><?php print render($content['field_data_set_id']); ?></identifier>
<revision><?php print render($content['field_eml_revision_id']); ?></revision>
</docid>
<documentType>eml://ecoinformatics.org/eml-2.1.0</documentType>
<documentURL><?php print token_replace('[site:url]') . 'node/' . $content["field_eml_link"]["#object"]->nid . '/eml';?></documentURL>
</document>