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diff --git a/sca-cpp/branches/lightweight-sca/modules/scdl/scdl.hpp b/sca-cpp/branches/lightweight-sca/modules/scdl/scdl.hpp
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+/*
+ * 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
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/* $Rev$ $Date$ */
+
+#ifndef tuscany_scdl_hpp
+#define tuscany_scdl_hpp
+
+/**
+ * SCDL read functions.
+ */
+
+#include "string.hpp"
+#include "list.hpp"
+#include "value.hpp"
+#include "monad.hpp"
+#include "xml.hpp"
+
+namespace tuscany {
+namespace scdl {
+
+/**
+ * Returns a list of components in a composite.
+ */
+const list<value> components(const value& l) {
+    const list<value> cs = elementChildren("composite", l);
+    if (isNil(cs))
+        return cs;
+    return elementChildren("component", car(cs));
+}
+
+/**
+ * Returns a list of service promotions in a composite.
+ */
+const list<value> promotions(const value& l) {
+    const list<value> cs = elementChildren("composite", l);
+    if (isNil(cs))
+        return cs;
+    return elementChildren("service", car(cs));
+}
+
+/**
+ * Returns the target or a service promotion.
+ */
+const value promote(const value& l) {
+    return attributeValue("promote", l);
+}
+
+/**
+ * Returns the name of a component, service or reference.
+ */
+const value name(const value& l) {
+    return attributeValue("name", l);
+}
+
+/**
+ * Convert a list of elements to a name -> element assoc list.
+ */
+const list<value> nameToElementAssoc(const list<value>& l) {
+    if (isNil(l))
+        return l;
+    const value e(car(l));
+    return cons<value>(mklist<value>(name(e), e), nameToElementAssoc(cdr(l)));
+}
+
+/**
+ * Returns the scdl declaration with the given name.
+ */
+struct filterName {
+    const value n;
+    filterName(const value& n) : n(n) {
+    }
+    const bool operator()(const value& v) const {
+        return name(v) == n;
+    }
+};
+
+const value named(const value& name, const value& l) {
+    const list<value> c = filter<value>(filterName(name), l);
+    if (isNil(c))
+        return value();
+    return car(c);
+}
+
+/**
+ * Returns the implementation of a component.
+ */
+const bool filterImplementation(const value& v) {
+    return isElement(v) && contains(string(cadr<value>(v)), "implementation.");
+}
+
+const value implementation(const value& l) {
+    const list<value> n = filter<value>(filterImplementation, l);
+    if (isNil(n))
+        return value();
+    return car(n);
+}
+
+/**
+ * Returns the URI of a service, reference or implementation.
+ */
+const value uri(const value& l) {
+    return attributeValue("uri", l);
+}
+
+/**
+ * Returns true if a reference is declared as wired by impl.
+ */
+const bool wiredByImpl(const value& l) {
+    return attributeValue("wiredByImpl", l) == string("true");
+}
+
+/**
+ * Returns a list of services in a component.
+ */
+const list<value> services(const value& l) {
+    return elementChildren("service", l);
+}
+
+/**
+ * Returns a list of references in a component.
+ */
+const list<value> references(const value& l) {
+    return elementChildren("reference", l);
+}
+
+/**
+ * Returns a list of bindings in a service or reference.
+ */
+const bool filterBinding(const value& v) {
+    return isElement(v) && contains(string(cadr<value>(v)), "binding.");
+}
+
+const list<value> bindings(const value& l) {
+    return filter<value>(filterBinding, l);
+}
+
+/**
+ * Returns the target of a reference.
+ */
+const value bindingsTarget(const list<value>& l) {
+    if (isNil(l))
+        return value();
+    const value u = uri(car(l));
+    if (!isNil(u))
+        return u;
+    return bindingsTarget(cdr(l));
+}
+
+const value target(const value& l) {
+    const value target = attributeValue("target", l);
+    if (!isNil(target))
+        return target;
+    return bindingsTarget(bindings(l));
+}
+
+/**
+ * Convert a list of references to a reference name -> target assoc list.
+ */
+const list<value> referenceToTargetAssoc(const list<value>& r) {
+    if (isNil(r))
+        return r;
+    const value ref(car(r));
+    return cons<value>(mklist<value>(scdl::name(ref), scdl::target(ref)), referenceToTargetAssoc(cdr(r)));
+}
+
+/**
+ * Returns a list of properties in a component.
+ */
+const list<value> properties(const value& l) {
+    return elementChildren("property", l);
+}
+
+/**
+ * Returns the type of an implementation.
+ */
+const value implementationType(const value& l) {
+    return elementName(l);
+}
+
+/**
+ * Returns the type of a binding.
+ */
+const value bindingType(const value& l) {
+    return elementName(l);
+}
+
+/**
+ * Returns the value of a property.
+ */
+const value propertyValue(const value& l) {
+    return elementValue(l);
+}
+
+/**
+ * Returns the absolute path of a resource in a contribution.
+ */
+const string resourcePath(const string& contrib, const string& path) {
+    return c_str(path)[0] == '/'? path : contrib + path;
+}
+
+}
+}
+
+#endif /* tuscany_scdl_hpp */