bool ExpressionBinding::apply(const std::string & propName)
{
    if (hasExpression()) {
        DocumentObject * docObj = path.getDocumentObject();

        if (!docObj)
            throw Base::Exception("Document object not found.");

        Gui::Command::doCommand(Gui::Command::Doc,"App.getDocument('%s').%s.setExpression('%s', u'%s')",
                                docObj->getDocument()->getName(),
                                docObj->getNameInDocument(),
                                path.toEscapedString().c_str(),
                                getEscapedExpressionString().c_str());
        return true;
    }
    else {
        if (isBound()) {
            DocumentObject * docObj = path.getDocumentObject();

            if (!docObj)
                throw Base::Exception("Document object not found.");

            if (lastExpression)
                Gui::Command::doCommand(Gui::Command::Doc,"App.getDocument('%s').%s.setExpression('%s', None)",
                                        docObj->getDocument()->getName(),
                                        docObj->getNameInDocument(),
                                        path.toEscapedString().c_str());
        }

        return false;
    }
}
void PropertyLinkSubList::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("LinkSubList");
    // get the value of my attribute
    int count = reader.getAttributeAsInteger("count");

    std::vector<DocumentObject*> values;
    values.reserve(count);
    std::vector<std::string> SubNames;
    SubNames.reserve(count);
    for (int i = 0; i < count; i++) {
        reader.readElement("Link");
        std::string name = reader.getAttribute("obj");
        // In order to do copy/paste it must be allowed to have defined some
        // referenced objects in XML which do not exist anymore in the new
        // document. Thus, we should silently ignore this.
        // Property not in an object!
        DocumentObject* father = static_cast<DocumentObject*>(getContainer());
        App::Document* document = father->getDocument();
        DocumentObject* child = document ? document->getObject(name.c_str()) : 0;
        if (child)
            values.push_back(child);
        else if (reader.isVerbose())
            Base::Console().Warning("Lost link to '%s' while loading, maybe "
                                    "an object was not loaded correctly\n",name.c_str());
        std::string subName = reader.getAttribute("sub");
        SubNames.push_back(subName);
    }

    reader.readEndElement("LinkSubList");

    // assignment
    setValues(values,SubNames);
}
void PropertyLink::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("Link");
    // get the value of my attribute
    std::string name = reader.getAttribute("value");

    // Property not in a DocumentObject!
    assert(getContainer()->getTypeId().isDerivedFrom(App::DocumentObject::getClassTypeId()) );

    if (name != "") {
        DocumentObject* parent = static_cast<DocumentObject*>(getContainer());

        App::Document* document = parent->getDocument();
        DocumentObject* object = document ? document->getObject(name.c_str()) : 0;
        if (!object) {
            if (reader.isVerbose()) {
                Base::Console().Warning("Lost link to '%s' while loading, maybe "
                                        "an object was not loaded correctly\n",name.c_str());
            }
        }
        else if (parent == object) {
            if (reader.isVerbose()) {
                Base::Console().Warning("Object '%s' links to itself, nullify it\n",name.c_str());
            }
            object = 0;
        }

        setValue(object);
    }
    else {
        setValue(0);
    }
}
Py::Object DocumentObjectPy::getDocument(void) const
{
    DocumentObject* object = this->getDocumentObjectPtr();
    Document* doc = object->getDocument();
    if (!doc) {
        return Py::None();
    }
    else {
        return Py::Object(doc->getPyObject(), true);
    }
}
void PropertyLinkList::Restore(Base::XMLReader &reader)
{
    // read my element
    reader.readElement("LinkList");
    // get the value of my attribute
    int count = reader.getAttributeAsInteger("count");
    App::PropertyContainer* container = getContainer();
    if (!container)
        throw Base::RuntimeError("Property is not part of a container");
    if (!container->getTypeId().isDerivedFrom(App::DocumentObject::getClassTypeId())) {
        std::stringstream str;
        str << "Container is not a document object ("
            << container->getTypeId().getName() << ")";
        throw Base::TypeError(str.str());
    }

    std::vector<DocumentObject*> values;
    values.reserve(count);
    for (int i = 0; i < count; i++) {
        reader.readElement("Link");
        std::string name = reader.getAttribute("value");
        // In order to do copy/paste it must be allowed to have defined some
        // referenced objects in XML which do not exist anymore in the new
        // document. Thus, we should silently ignore this.
        // Property not in an object!
        DocumentObject* father = static_cast<DocumentObject*>(getContainer());
        App::Document* document = father->getDocument();
        DocumentObject* child = document ? document->getObject(name.c_str()) : 0;
        if (child)
            values.push_back(child);
        else if (reader.isVerbose())
            Base::Console().Warning("Lost link to '%s' while loading, maybe "
            "an object was not loaded correctly\n", name.c_str());
    }

    reader.readEndElement("LinkList");

    // assignment
    setValues(values);
}