• https://de.wikipedia.org/wiki/Minuszeichen
• http://www.fileformat.info/info/unicode/category/Pd/list.htm
• https://www.cs.tut.fi/~jkorpela/dashes.html

hyphen-minus		U+002D	// used for either hyphen or minus sign
non-breaking		U+00A0
soft hyphen		U+00AD

hyphen 			U+2010	// unambiguously a hyphen character, as in “left-to-right”; 
				// narrow width

non-breaking hyphen 	U+2011	// as hyphen (U+2010), but not an allowed line break point

figure dash 		U+2012	// as hyphen-minus, but has the same width as digits


en dash 		U+2013	// used e.g. to indicate a range of values
em dash 		U+2014	// used e.g. to make a break in the flow of a sentence

hyphen bullet 		U+2043
minus sign		U+2212	// an arithmetic operator; 		
				// the glyph may look the same as the glyph for a hyphen-minus, 
				// or may be longer 

http://www.pdf-accessible.com/en/

<Sect> Page 7
	<P>
		discovered by Professor Bienlein 
		<Span>
			(1)
	<L>
		<LI>			
			<Note>
				(1) Bienlein: All you ever wanted to know about...

Several footnotes are present on page 7 of the tagging exercise book (tagged-exercise-book.pdf). The footnote callouts are tagged with a span <Span> tag, and each one has an alternate text entered (for example, “see note 1”). Then, the footnotes present at the bottom of the page are added to the <Note> tag.

Note: It is important that the footnotes are read as soon as possible after the footnote callout, without, nonetheless, interrupting the flow of information. For example, when there is a footnote callout within a paragraph, have the paragraph read until the end, and then read the footnote afterwards by placing the corresponding tag just after it.