Xy-pic User's Guide

4.2 Backwards compatibility

The first widely distributed version of Xy-pic was version 2 (from release 1.40 to release 2.6). A special compatibility mode is used automatically if the old style of loading is used (using files named xypic.tex and xypic.sty). You can also mix old and new diagrams in a document if you load as described in section 1.1 and add the declaration \xyoption{v2}. This provides almost full backwards compatibility: the following are the only known exceptions:

• Automatic "shortening" of arrow tails by |<< break was a bug and has been "fixed" so it does not work any more. Fix: Put a |<\hole break before it as described in section 2.3.
• The release 2.6 * position operator is not available. Fix: Use the : and :: operators (described in detail in the reference manual [8]).
• Using as the target of an arrow command does not work. Fix: Enclose it in braces, i.e., write .
• The old \pit, \apit, and \bpit commands are not defined. Fix: Use *@{>} (or \tip) with variants and rotation.
• The even older notation where an argument in braces to \rto and the others was automatically taken to be a "tail" is not supported. Fix: Use the supported |<... notation.

Finally note that sometimes the spacing with version 3.3 is "improved" relative to earlier versions  . Please report all other things that do not work the same in version 2.6 and 3.3 to the author.

 

Xy-pic User's Guide

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© Kristoffer H. Rose <krisrose@brics.dk> January 6, 1997 / LaTeX2HTMLv96.1-h