A self-describing message contains the data and metadata describing the format and meaning of a message. They usually contain all the data needed to understand the message, and all the information necessary to complete a task. Self-describing messages help in reducing the amount of coupling between components throughout the system, and in...
In general, an attribute is a characteristic. In a database management system (DBMS), an attribute refers to a database component, such a table. It also may refer to a database field. Attributes describe the instances in the row of a database.
Think of a table in a relational database as being analogous to a spreadsheet. An attribute is simply one non-null cell in the spreadsheet, or the conjunction of a column and row. It stores only one piece of data about the object represented by the table in which the attribute belongs. For example, the attributes in an invoice might be price, number, date or paid/unpaid, etc.
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