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The quote marks must be the standard, straight, double quotation marks ("); curly or other quotes will be parsed as part of the reference name. You may optionally provide reference names even when the reference name is not required. This makes later re-use of the sourced reference easier.
Ex. 1) There are three references defined in the list, but none are invoked in the content: Lorem ipsum dolor sit amet, consectetur adipisicing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua.
You may have misspelled the reference name, used special characters that look the same but are actually different, or the original named reference is missing (for example, if you just copied and pasted the invoked ref).
Names must be unique. You may not use the same name to define different groups or footnotes. Try to avoid picking a name that someone else is likely to choose for a new citation, such as ":0" or "NYT". Please consider keeping reference names short, simple, and restricted to the standard English alphabet and numerals. If spaces are used, the ...
A list-defined reference has an invalid name. Ensure the footnote name is formatted properly. More than one use of {{}} or #tag:ref within list defined references. You can only use {{}} or #tag:ref once as a list-defined reference.
The named reference "$1" was defined multiple times with different content (see the help page). A list-defined reference with the name "$1" has been invoked, but is not defined in the <references> tag (see the help page). A <ref follow="…"> tag that is the continuation of a previous one can neither be named individually nor extended; Cite ...
File existence check Checks that a file with a specified name exists. This check is essential for programs that use file handling. Format check Checks that the data is in a specified format (template), e.g., dates have to be in the format YYYY-MM-DD. Regular expressions may be used for this kind of validation. Presence check
For example, if the value in Cell A1 is to be obtained by adding 5 to the value in Cell B1, and the value in Cell B1 is to be obtained by adding 3 to the value in Cell A1, no values can be computed. (Even if the specifications are A1:=B1+5 and B1:=A1-5, there is still a circular reference.