diff --git a/source/java/org/alfresco/rest/api/nodes/NodeSecondaryChildrenRelation.java b/source/java/org/alfresco/rest/api/nodes/NodeSecondaryChildrenRelation.java
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+++ b/source/java/org/alfresco/rest/api/nodes/NodeSecondaryChildrenRelation.java
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+/*
+ * Copyright (C) 2005-2016 Alfresco Software Limited.
+ *
+ * This file is part of Alfresco
+ *
+ * Alfresco is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Alfresco is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with Alfresco. If not, see <http://www.gnu.org/licenses/>.
+ */
+package org.alfresco.rest.api.nodes;
+
+import org.alfresco.rest.api.model.AssocChild;
+import org.alfresco.rest.api.model.Node;
+import org.alfresco.rest.api.model.UserInfo;
+import org.alfresco.rest.framework.WebApiDescription;
+import org.alfresco.rest.framework.core.exceptions.ConstraintViolatedException;
+import org.alfresco.rest.framework.core.exceptions.InvalidArgumentException;
+import org.alfresco.rest.framework.resource.RelationshipResource;
+import org.alfresco.rest.framework.resource.actions.interfaces.RelationshipResourceAction;
+import org.alfresco.rest.framework.resource.parameters.CollectionWithPagingInfo;
+import org.alfresco.rest.framework.resource.parameters.Paging;
+import org.alfresco.rest.framework.resource.parameters.Parameters;
+import org.alfresco.service.cmr.repository.AssociationExistsException;
+import org.alfresco.service.cmr.repository.ChildAssociationRef;
+import org.alfresco.service.cmr.repository.DuplicateChildNodeNameException;
+import org.alfresco.service.cmr.repository.NodeRef;
+import org.alfresco.service.namespace.QName;
+import org.alfresco.service.namespace.QNamePattern;
+import org.alfresco.service.namespace.RegexQNamePattern;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * Node Secondary Children
+ *
+ * Manage secondary child associations (sometimes also known as multi-filing)
+ *
+ * Please note, if you wish to manage primary child associations then please refer to other endpoints, for example:
+ *
+ * - to create primary child, use POST /nodes/{parentId}/children
+ * - to delete node (ie. primary child), use DELETE /nodes/{nodeId}
+ * - to move a node from one primary parent to another, use POST /nodes/{nodeId}/copy
+ *
+ * @author janv
+ */
+@RelationshipResource(name = "secondary-children",  entityResource = NodesEntityResource.class, title = "Node Secondary Children")
+public class NodeSecondaryChildrenRelation extends AbstractNodeRelation implements
+        RelationshipResourceAction.Read<Node>,
+        RelationshipResourceAction.Create<AssocChild>,
+        RelationshipResourceAction.Delete
+{
+    /**
+     * List secondary children only
+     *
+     * @param parentNodeId String id of parent node
+     */
+    @Override
+    @WebApiDescription(title = "Return a paged list of secondary child nodes based on child assocs")
+    public CollectionWithPagingInfo<Node> readAll(String parentNodeId, Parameters parameters)
+    {
+        NodeRef parentNodeRef = nodes.validateOrLookupNode(parentNodeId, null);
+
+        QNamePattern assocTypeQNameParam = getAssocTypeFromWhereElseAll(parameters);
+
+        List<ChildAssociationRef> assocRefs = null;
+        if (assocTypeQNameParam.equals(RegexQNamePattern.MATCH_ALL))
+        {
+            assocRefs = nodeService.getChildAssocs(parentNodeRef);
+        }
+        else
+        {
+            assocRefs = nodeService.getChildAssocs(parentNodeRef, assocTypeQNameParam, RegexQNamePattern.MATCH_ALL);
+        }
+
+        Map<QName, String> qnameMap = new HashMap<>(3);
+
+        Map<String, UserInfo> mapUserInfo = new HashMap<>(10);
+
+        List<String> includeParam = parameters.getInclude();
+
+        List<Node> collection = new ArrayList<>(assocRefs.size());
+        for (ChildAssociationRef assocRef : assocRefs)
+        {
+            if (! assocRef.isPrimary())
+            {
+                // minimal info by default (unless "include"d otherwise)
+                Node node = nodes.getFolderOrDocument(assocRef.getChildRef(), null, null, includeParam, mapUserInfo);
+
+                QName assocTypeQName = assocRef.getTypeQName();
+                String assocType = qnameMap.get(assocTypeQName);
+                if (assocType == null)
+                {
+                    assocType = assocTypeQName.toPrefixString(namespaceService);
+                    qnameMap.put(assocTypeQName, assocType);
+                }
+
+                QName assocChildQName = assocRef.getQName();
+                String childQNameStr = qnameMap.get(assocChildQName);
+                if (childQNameStr == null)
+                {
+                    childQNameStr = assocChildQName.toPrefixString(namespaceService);
+                    qnameMap.put(assocChildQName, childQNameStr);
+                }
+
+                node.setAssociation(new AssocChild(assocType, assocRef.isPrimary(), childQNameStr));
+
+                collection.add(node);
+            }
+        }
+
+        Paging paging = parameters.getPaging();
+        return CollectionWithPagingInfo.asPaged(paging, collection, false, collection.size());
+    }
+
+    @Override
+    @WebApiDescription(title="Add secondary child assoc")
+    public List<AssocChild> create(String parentNodeId, List<AssocChild> entity, Parameters parameters)
+    {
+        List<AssocChild> result = new ArrayList<>(entity.size());
+
+        NodeRef parentNodeRef = nodes.validateNode(parentNodeId);
+
+        for (AssocChild assoc : entity)
+        {
+            QName assocTypeQName = getAssocType(assoc.getAssocType(), true);
+
+            String childQNameStr = assoc.getChildQName();
+            if ((childQNameStr == null) || childQNameStr.isEmpty())
+            {
+                throw new InvalidArgumentException("Missing childQName");
+            }
+
+            QName childQName = QName.createQName(childQNameStr, namespaceService);
+
+            try
+            {
+                NodeRef childNodeRef = nodes.validateNode(assoc.getChildId());
+                nodeService.addChild(parentNodeRef, childNodeRef, assocTypeQName, childQName);
+            }
+            catch (AssociationExistsException aee)
+            {
+                throw new ConstraintViolatedException(aee.getMessage());
+            }
+            catch (DuplicateChildNodeNameException dcne)
+            {
+                throw new ConstraintViolatedException(dcne.getMessage());
+            }
+
+            result.add(assoc);
+        }
+        return result;
+    }
+
+    @Override
+    @WebApiDescription(title = "Remove secondary child assoc(s)")
+    public void delete(String parentNodeId, String childNodeId, Parameters parameters)
+    {
+        NodeRef parentNodeRef = nodes.validateNode(parentNodeId);
+        NodeRef childNodeRef = nodes.validateNode(childNodeId);
+
+        QName assocTypeQName = getAssocType(parameters.getParameter("assocType"), false);
+
+        String childQNameStr = parameters.getParameter("childQName");
+        QName childQName = null;
+        if ((childQNameStr != null) && (!childQNameStr.isEmpty()))
+        {
+            childQName = QName.createQName(childQNameStr, namespaceService);
+        }
+
+        if (assocTypeQName != null)
+        {
+            if (childQName != null)
+            {
+                ChildAssociationRef assocRef = new ChildAssociationRef(assocTypeQName, parentNodeRef, childQName, childNodeRef);
+                nodeService.removeSecondaryChildAssociation(assocRef);
+            }
+            else
+            {
+                throw new InvalidArgumentException("Missing childQName (in addition to assocType)");
+            }
+        }
+        else if (childQName != null)
+        {
+            throw new InvalidArgumentException("Missing assocType (in addition to childQName)");
+        }
+        else
+        {
+            List<ChildAssociationRef> assocRefs = nodeService.getChildAssocs(parentNodeRef);
+            for (ChildAssociationRef assocRef : assocRefs)
+            {
+                if (assocRef.getChildRef().equals(childNodeRef) && (! assocRef.isPrimary()))
+                {
+                    nodeService.removeSecondaryChildAssociation(assocRef);
+                }
+            }
+        }
+    }
+}