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On Fri, 5 Dec 2008, Philippe Poulard wrote:

> This is a somewhat deprecated usage inherited from the SGML days. I 
> remember I used such machinery 10 years ago to have documents composed 
> of text and binary contents. This had some sense since tools were 
> supported it (I mean SGML/XML editors), but today, people tend to stick 
> media to their documents à la HTML, with a simple href attribute.

Ah, i see. Thanks for your answer. I will proceed to completely forget 
about notations and external entities!

tom

> Tom Anderson a écrit :
>> Hi all,
>> 
>> I can see from the XML spec what processing instructions and notations are, 
>> syntactically. I even just about understand how notations relate to 
>> external entities. But i don't understand what you'd actually use them for 
>> in practice!
>> 
>> The one example i've found is using an xml-stylesheet PI to specify a 
>> stylesheet. Are there others?
>> 
>> How about notations and external entities? Is the idea that they're a 
>> mechanism of linkage to external files that's more concrete than just using 
>> a URL? So, if i was writing a bizarro world HTML, i could specify images 
>> like this in the DTD:
>> 
>> <!NOTATION jpeg SYSTEM "http://some-kind-of-URL">
>> <!NOTATION png SYSTEM "http://some-other-kind-of-URL">
>> <!ELEMENT img EMPTY>
>> <!ATTLIST img
>>     src ENTITY
>>     alt CDATA #IMPLIED >
>> 
>> Then in my document i could write:
>> 
>> <!DOCTYPE img PUBLIC "-//Bizarro HTML" "http://bizarrohtml" [
>>  <!ENTITY lena SYSTEM "lena.jpg" NDATA jpg>
>> ]>
>> <img src="lena" alt="picture of Lena"/>
>> 
>> ?
>> 
>> Can i also use that entity in regular text, like:
>> 
>> <p>Here is a picture of Lena &lena;</p>
>> 
>> ?
>> 
>> And in both cases, what does it *mean*? If i parsed that into DOM and 
>> called getAttribute("src") on the img element, what would i get back?
>> 
>> What's the point of being able to declare an attribute as being of type 
>> NOTATION?
>> 
>> And does anyone actually use any of this stuff?
>> 
>> tom
>> 
>
>
>

-- 
Better to die on your feet than live on your knees. -- Emiliano Zapata
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