UML deployment diagram - Real estate transactions

"A real estate transaction is the process whereby rights in a unit of property (or designated real estate) is transferred between two or more parties, e.g. in case of conveyance one party being the seller(s) and the other being the buyer(s). It can often be quite complicated due to the complexity of the property rights being transferred, the amount of money being exchanged, and government regulations. Conventions and requirements also vary considerably among different countries of the world and among smaller legal entities (jurisdictions).
In more abstract terms, a real estate transaction, like other financial transactions, causes transaction costs. To identify and possibly reduce these transaction costs, the Organization for Economic Co-operation and Development (OECD) addressed the issue through a study commissioned by the European Commission, and through a research action.
The mentioned research action ‘Modelling Real Property Transactions’ investigated methods to describe selected transactions in a formal way, to allow for comparisons across countries / jurisdictions. Descriptions were performed both using a more simple format, a Basic Use Case template, and more advanced applications of the Unified Modelling Language. Process models were compared through an ontology-based methodology, and national property transaction costs were estimated for Finland and Denmark, based on the directions of the United Nations System of National Accounts." [Real estate transaction. Wikipedia]
The UML deployment diagram example "Real estate transactions" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Rapid UML solution from the Software Development area of ConceptDraw Solution Park.

"A broker is an individual or party (brokerage firm) that arranges transactions between a buyer and a seller for a commission when the deal is executed. A broker who also acts as a seller or as a buyer becomes a principal party to the deal. Distinguish agent - one who acts on behalf of a principal. ...
In general a broker is an independent agent used extensively in some industries. A broker's prime responsibility is to bring sellers and buyers together and thus a broker is the third-person facilitator between a buyer and a seller. An example would be a real estate broker who facilitates the sale of a property.
Brokers also can furnish market information regarding prices, products, and market conditions. Brokers may represent either the seller (90% of the time) or the buyer (10%) but not both at the same time. An example would be a stockbroker, who makes the sale or purchase of securities on behalf of his client. Brokers play a huge role in the sale of stocks, bonds, and other financial services." [Broker. Wikipedia]
The UML composite structure diagram example "Sale process" was created using the ConceptDraw PRO diagramming and vector drawing software extended with the Rapid UML solution from the Software Development area of ConceptDraw Solution Park.