On 27 Jan 2022, at 23:58, Roger L Costello <costello@m...> wrote:

Assume the XML document has no CDATA sections, PIs, comments, or DOCTYPE.

1. You are shown just a slice of an XML document:

              > some text (possibly whitespace) not containing the less than symbol </

That is, you see a greater-than symbol, some text, and then a less-than symbol followed by a forward slash. You are not shown the stuff before > nor the stuff after </

What is it? Does the slice signify an element: the part before > is the start tag, the part after </ is its end tag, and text is the content of the element?

2. You are shown another slice of an XML document:

              >  whitespace <C

C = letter of the alphabet, colon, or underscore.

Does that slice signify the end of one element and the start of another element: the part before > is an end tag, the C in <C is the first character of a start tag, and whitespace separates the end tag from the start tag?

3. Is an end tag always followed by a less-than symbol (possibly with whitespace separating them)?

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1. You are shown just a slice of an XML document:

              > some text (possibly whitespace) not containing the less than symbol </

That is, you see a greater-than symbol, some text, and then a less-than symbol followed by a forward slash. You are not shown the stuff before > nor the stuff after </

What is it? Does the slice signify an element: the part before > is the start tag, the part after </ is its end tag, and text is the content of the element?

Answer: It might signify an element (start tag, content, end tag), e.g., <greeting>Hello, world</greeting>

But it might not. It might signify an end tag followed by another end tag, e.g., </D>   </A>

2. You are shown another slice of an XML document:

              >  whitespace <C

C = letter of the alphabet, colon, or underscore.

Does that slice signify the end of one element and the start of another element: the part before > is an end tag, the C in <C is the first character of a start tag, and whitespace separates the end tag from the start tag?

Answer: It might signify the end of one element and the start of another element (with some whitespace between them), e.g., </book>   <magazine>

But it might not. It might signify an element embedded in another element (with some whitespace between them), e.g., <document>    <paragraph>

3. Is an end tag always followed by a less-than symbol (possibly with whitespace separating them)?

Answer: Yes, with one exception: the end tag of the root element is not followed by a less-than symbol.