Future date data typically refers to a date or time that is yet to occur. It can be represented in various formats, such as a specific date or time, a range of dates or times, or a formula that calculates a future date based on a given input. Future date data is often used in scheduling, planning, forecasting, and other applications that require predictions or projections of future events.
In XML, validation refers to the process of checking the structure and content of an XML document against a set of rules specified by a schema or Document Type Definition (DTD). Validation is used to ensure that the document adheres to a predefined structure and contains only the allowed elements, attributes, and values.
Well-formedness, on the other hand, refers to the basic syntactical rules of XML. A well-formed XML document must have a root element, properly nested elements, and correctly formatted attributes. However, well-formedness does not guarantee that the document follows a specific structure or content model, as defined by a schema or DTD.
In summary, validation is a more stringent check compared to well-formedness and is used to ensure the correctness and consistency of the data stored in an XML document.