Escape code issues
Joe Krahn krahn at niehs.nih.govFri Mar 9 23:34:34 GMT 2007
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Are the special character codes intended to be active for regular string items? I see this Greek letter usage in an example from http://www.iucr.org/iucr-top/cif/developers/starddl/silly2.cif _diffrn_radiation.type 'Cu K\a' The same page references a ddl_3 dictionary with this: "length_squared 'picometres squared (meters * 10^(-12))^2'" Using CIF codes, that string should mark "(-12))" as superscript, right? Also: The DDL dictionaries mention an exception to POSIX regular expression by allowing '\t' and '\n'. My understanding is that these characters are ordinary valid characters in the POSIX specification, and it is only the backslash notation that is not allowed. So, this section really only needs to state that the \n and \t sequences must be transformed to newline and tab to represent obtain the actual regular-expression string. Joe Krahn
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