On Mon, 19 Sep 2011 05:44:27 +0200 Philippe Verdy <[email protected]> wrote:
> 2011/9/19 Peter Edberg <[email protected]>: > > <snip> The whole point > > of LDM was to be able to create semi-structured elements such as > > the example in UAX #9 section 5.6 *without* knowing in advance > > the direction context in which the element would be used. > > You absolutely don't need to know in advance the direction of context > before using LRE..PDF or RLE..PDF. It will work in both directions, > ordering and separating the fields in the same order as this context. > So yes LRE..PDF and RLE..PDF create a semi-structure, which does fit. Actually, no. A sequence <LRE embedded_1 PDF N LRE embedded_2 PDF> will result in N being resolved as L by rule N1. Consequently embedded_1 will display to the left of embedded_2 whatever the context. You still need something like <LRE embedded_1 PDF RLM N LRE embedded_2 PDF> to force embedded_1 to display before embedded_2 whichever the directionality of the embedding within which these occur. (DLM could substitute for RLM and avoid untidily placed non-rendering runs.) Alternatively, you could alternate LRE...PDF and RLE...PDF. You also need extra marks to avoid the structure sucking in adjacent elements - you need either <RLM LRE embedded_1 PDF RLM N LRE embedded_2 PDF RLM> or <DLM LRE embedded_1 PDF DLM N LRE embedded_2 PDF DLM> Actually, I suppose you might benefit from replacing the final mark above by an ALM. Using embeddings has the advantage that one doesn't have to worry about Arabic or European numbers. Richard.
