diff --git a/pycsw/plugins/profiles/apiso/apiso.py b/pycsw/plugins/profiles/apiso/apiso.py
index 97fade44a..345b67ed1 100644
--- a/pycsw/plugins/profiles/apiso/apiso.py
+++ b/pycsw/plugins/profiles/apiso/apiso.py
@@ -688,13 +688,19 @@ def write_record(self, result, esn, outputschema, queryables, caps=None):
                 etree.SubElement(linkage, util.nspath_eval('gmd:URL', self.namespaces)).text = link['url']
 
                 protocol = etree.SubElement(online2, util.nspath_eval('gmd:protocol', self.namespaces))
-                etree.SubElement(protocol, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['protocol']
+                etree.SubElement(protocol, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link.get('protocol', 'WWW:LINK')
 
-                name = etree.SubElement(online2, util.nspath_eval('gmd:name', self.namespaces))
-                etree.SubElement(name, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['name']
+                if 'name' in link:
+                    name = etree.SubElement(online2, util.nspath_eval('gmd:name', self.namespaces))
+                    etree.SubElement(name, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['name']
 
-                desc = etree.SubElement(online2, util.nspath_eval('gmd:description', self.namespaces))
-                etree.SubElement(desc, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['description']
+                if 'description' in link:
+                    desc = etree.SubElement(online2, util.nspath_eval('gmd:description', self.namespaces))
+                    etree.SubElement(desc, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['description']
+
+                if 'function' in link:
+                    desc = etree.SubElement(online2, util.nspath_eval('gmd:function', self.namespaces))
+                    etree.SubElement(desc, util.nspath_eval('gco:CharacterString', self.namespaces)).text = link['function']
 
         return node