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diff --git a/configmgr/source/partial.cxx b/configmgr/source/partial.cxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#include <sal/config.h>
+
+#include <cassert>
+#include <set>
+
+#include <com/sun/star/uno/RuntimeException.hpp>
+#include <rtl/ustring.hxx>
+#include <sal/types.h>
+
+#include "data.hxx"
+#include "partial.hxx"
+
+namespace configmgr {
+
+namespace {
+
+bool parseSegment(
+    OUString const & path, sal_Int32 * index, OUString * segment)
+{
+    assert(
+        index != nullptr && *index >= 0 && *index <= path.getLength() &&
+        segment != nullptr);
+    if (path[(*index)++] == '/') {
+        OUString name;
+        bool setElement;
+        OUString templateName;
+        *index = Data::parseSegment(
+            path, *index, &name, &setElement, &templateName);
+        if (*index != -1) {
+            *segment = Data::createSegment(templateName, name);
+            return *index == path.getLength();
+        }
+    }
+    throw css::uno::RuntimeException("bad path " + path);
+}
+
+}
+
+Partial::Partial(
+    std::set< OUString > const & includedPaths,
+    std::set< OUString > const & excludedPaths)
+{
+    // The Partial::Node tree built up here encodes the following information:
+    // * Inner node, startInclude: an include starts here that contains excluded
+    //   sub-trees
+    // * Inner node, !startInclude: contains in-/excluded sub-trees
+    // * Leaf node, startInclude: an include starts here
+    // * Leaf node, !startInclude: an exclude starts here
+    for (auto const& includedPath : includedPaths)
+    {
+        sal_Int32 n = 0;
+        for (Node * p = &root_;;) {
+            OUString seg;
+            bool end = parseSegment(includedPath, &n, &seg);
+            p = &p->children[seg];
+            if (p->startInclude) {
+                break;
+            }
+            if (end) {
+                p->children.clear();
+                p->startInclude = true;
+                break;
+            }
+        }
+    }
+    for (auto const& excludedPath : excludedPaths)
+    {
+        sal_Int32 n = 0;
+        for (Node * p = &root_;;) {
+            OUString seg;
+            bool end = parseSegment(excludedPath, &n, &seg);
+            if (end) {
+                p->children[seg].clear();
+                break;
+            }
+            Node::Children::iterator j(p->children.find(seg));
+            if (j == p->children.end()) {
+                break;
+            }
+            p = &j->second;
+        }
+    }
+}
+
+Partial::~Partial() {}
+
+Partial::Containment Partial::contains(std::vector<OUString> const & path) const {
+    //TODO: For set elements, the segment names recorded in the node tree need
+    // not match the corresponding path segments, so this function can fail.
+
+    // * If path ends at a leaf node or goes past a leaf node:
+    // ** If that leaf node is startInclude: => CONTAINS_NODE
+    // ** If that leaf node is !startInclude: => CONTAINS_NOT
+    // * If path ends at inner node:
+    // ** If there is some startInclude along its trace: => CONTAINS_NODE
+    // ** If there is no startInclude along its trace: => CONTAINS_SUBNODES
+    Node const * p = &root_;
+    bool bIncludes = false;
+    for (auto const& elemPath : path)
+    {
+        Node::Children::const_iterator j(p->children.find(elemPath));
+        if (j == p->children.end()) {
+            return p->startInclude ? CONTAINS_NODE : CONTAINS_NOT;
+        }
+        p = &j->second;
+        bIncludes |= p->startInclude;
+    }
+    return p->children.empty() && !p->startInclude
+        ? CONTAINS_NOT
+        : bIncludes ? CONTAINS_NODE : CONTAINS_SUBNODES;
+}
+
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */