Markup spec/BNF/Magic links

Magic links are words that may appear within  that are automatically converted to external links without any special markup being required by the person writing the page.

	::= |  | 

Note that all character-literals on this page are case sensitive (i.e. upper-case characters in the definitions on this page MUST be written in upper case in the markup).

ISBN numbers
See Manual:ISBN

	::= ("97" ("8" | "9")? (" " | "-")?) (DIGIT (" " | "-")?) {9} (DIGIT | "X" | "x")

Examples:
 * ISBN 1234567890
 * ISBN 123456789x
 * ISBN                            1 2 3-4-5 6789 X
 * ISBN 978-9999999999

Counter-examples:
 * ISBN 12345678901 (not followed by non-word character )
 * ISBN 123456789 (too short)
 * ISBN 97-81234567890 (dashes not allowed in prefix)
 * ISBN1234567890 (no spaces)

RFCs
See Manual:RFC

	::= "RFC"

PubMed IDs
	::= "PMID"