Urban green spaceIn land-use planning, urban green space is open-space areas reserved for parks and other "green spaces", including plant life, water features - also referred to as blue spaces - and other kinds of natural environment. Most urban open spaces are green spaces, but occasionally include other kinds of open areas. The landscape of urban open spaces can range from playing fields to highly maintained environments to relatively natural landscapes.
Free imperial cityIn the Holy Roman Empire, the collective term free and imperial cities (Freie und Reichsstädte), briefly worded free imperial city (Freie Reichsstadt, urbs imperialis libera), was used from the fifteenth century to denote a self-ruling city that had a certain amount of autonomy and was represented in the Imperial Diet. An imperial city held the status of Imperial immediacy, and as such, was subordinate only to the Holy Roman Emperor, as opposed to a territorial city or town (Landstadt) which was subordinate to a territorial prince - be it an ecclesiastical lord (prince-bishop, prince-abbot) or a secular prince (duke (Herzog), margrave, count (Graf), etc.
