On Thu, 11 Oct 2018, Martin Sebor wrote: > (Or are there some differences between the underscored forms and > the one without it)?
They should always behave the same. > With a few exceptions (like aligned) the built-in returns false > for attributes that aren't attached to a node. I haven't exercised > nearly all the attributes yet, and this one could very well be among > those that aren't and perhaps can't be handled. I suspect some > target attributes might be in the same group. If there's no way > to tell it should probably be documented as a limitation of > the function, maybe also under the attribute itself that can't > be detected. Alternatively, the built-in return type could be > changed to a tri-state: "don't know," false, true. Can you > think of a better solution? I don't have a better solution. -- Joseph S. Myers jos...@codesourcery.com
