[NTG-context] TeX in \xmlsetentity and DTDs in DOCTYPEs
kate at elide.org
Mon Jan 18 21:49:34 CET 2016
On 18 January 2016 at 19:13, Hans Hagen <pragma at wxs.nl> wrote:
> On 1/18/2016 5:22 PM, Kate F wrote:
>> On 18 January 2016 at 13:30, Thomas A. Schmitz
>> <thomas.schmitz at uni-bonn.de> wrote:
>>> On 01/17/2016 07:24 PM, Hans Hagen wrote:
>>>> it should work in the in beta now
>>> Hi Hans,
>>> now I have a problem :-) What should take precedence if an entity is both
>>> defined in the dtd and as a \xmltexentity? The way I see it, the latter:
>>> e.g., in the DTD, I might declare something for use in a browser but
>>> a different solution when typesetting with ConTeXt. The latest and
>>> now takes my DTD definitions instead of the \xmltexentities, which did
>>> happen before. Is that an unwanted side effect or the new default?
>> Ah, there's a bug:
>> <!ENTITY i.opt "<option>-i</option>">
>> This should produce an <option> node in the DOM tree, just as if you'd
>> typed that out where the entity is used. Currently ConTeXt takes that
>> as literal text, as if you'd typed "<option>-i<option/>"
>> Often I wish XML weren't so complex...
> are you sure? i've never seen that
These are called "internal parsed entities". "Parsed" requires that
any tags *inside* the entity must be balanced, unlike in SGML
Sorry I can't find a clear explanation in the XML spec; it's a pretty
But here's some random person's slide illustrating an example:
libxml2 deals with these correctly, which is what I've been using
(xsltproc and friends) for my documents which use them. I generally
trust libxml2 to get things right.
I use these entities to centralise often-repeated fragments between
documents, kind of like how you might use a primitive macro in TeX.
So for example in one external DTD I have some general things:
<!ENTITY macro.arg "<replaceable>macro</replaceable>">
<!ENTITY equal.lit "<literal>=</literal>">
And then in one specific document's internal entities, something which
Then if I change my mind about how I want to mark up "=", for example,
I only have one place to change it. This makes life with XML a little
bit less painful.
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