An XML document can be well-formed even if it is NOT valid.

Question

BlackTom AI · Accepted Answer

To begin, consider the distinction between well-formedness and validity in XML. Well-formedness refers to syntactic correctness: proper tag nesting, matching start and end tags, a single root element, and correct use of characters and entities. Validity, on the other hand, requires the document to conform to a DTD, XML Schema, or other schema or document type definition.

Option analysis:
- Statement: 'An XML document can be well-formed even if it is NOT valid.' This is true. An XML document may satisfy all the syntactic rules that define well-formed XML without adhering to any schema or DTD. Such a document would be parsed successfully by an XML processor as well-formed, but it would not be considered valid because it does not conform to the constraints defined by a schema or DTD.

- If we were to consider a false option (even though none is provided here), it would say that a document must be valid to be well-formed, which is incorrect. The well-formedness check happens independently of validation; a document can pass the structural checks (well-formed) while failing the schema checks (validation).

Additional clarity: A well-formed document is enough for basic XML processing, such as parsing into a tree structure. Validation adds higher guarantees, ensuring the content adheres to business or data rules defined in a schema. Therefore, the existence of well-formed but invalid XML is a common scenario in real-world data exchange.

DATA2001 DATA2901 (ND) Week 07 Quiz

An XML document can be well-formed even if it is NOT valid.

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