OASIS Mailing List ArchivesView the OASIS mailing list archive below
or browse/search using MarkMail.


Help: OASIS Mailing Lists Help | MarkMail Help



   Re: [xml-dev] ASN.1 is an XML Schema Language (Fix those lists!)and Bina

[ Lists Home | Date Index | Thread Index ]

On Sat, 1 Nov 2003 23:16:03 -0500
"Alessandro Triglia" <sandro@mclink.it> wrote:
> Rich Salz ha scritto:
> > 
> > I think you misunderstand Simon.  Does ASN.1/X.694 have the 
> > equivalent of a "text node"?  For example:
> > 	<foo>this is <item>1<item> line of text with
> >         <item>2</item> numbers in it.</foo>
> > 
> > What about
> > 	<foo>A second line with <item>1<item>, <item>2</item>, no,
> >         <item>3</item> numbers.</foo>
> > 
> > In XML Schema, those match the same definition of foo.  How 
> > do you write the equivalent in ASN.1/X.694?

Please note the question.  The answer doesn't address it.

> ASN.1 supports mixed content in the "Extended XML encoding rules"
> You can write a type definition such as the following:
> ----------------------
> MyElementTypeWithMixedContent ::= [EMBED-VALUES] SEQUENCE {
> 	embed-values SEQUENCE OF UTF8String,
> 	an-attribute [ATTRIBUTE] INTEGER,
> 	another-attribute [ATTRIBUTE] UTF8String,
> 	a-child-element AnotherElementType,
> 	another-child-element INTEGER
> }
> ----------------------
> [EMBED-VALUES] and [ATTRIBUTE] are examples of "XER encoding
> instructions".
> The [EMBED-VALUES] encoding instruction assigned to the SEQUENCE type
> causes the multiple strings of the "embed-values" component (the first
> component of the SEQUENCE) to provide the text that is interleaved
> with the child elements (before the first one, between each pair, and
> after the last one). In this example, there are two (mandatory) child
> elements ("a-child-element" and "another-child-element"), so there
> must be exactly three strings(possibly empty) in the SEQUENCE OF
> UTF8String.

But that isn't mixed content.  Not in the XML sense.  If I *must* write
<p>String <b>emphasized</b> the end.</p>  But I *want* to write
<p>String <b>some <i>real nonsense</i>, no?</b> Or perhaps

Classic document-style mixed content.  Very useful stuff if, for
instance, you're embedding documentation into a product description. 
The example provided, if I understand it correctly, cannot support that.

ASN.1 as a non-mixed-content schema language for XML that has the
ability to generate [unparsable, disastrously fragile*] compact binary
structures has interesting use cases.  An inability to support mixed
content means it isn't a replacement for DTDs, WXS, or RNG, all of which
do have that capability.

* she didn't really say that, did she?
Amelia A. Lewis                    amyzing {at} talsever.com
According to Business Week, in the 1990s the ratio between a chief
executive's salary and the takehome pay of the typical, feckless, 
whining grunt on the shopfloor rose from 85:1 to 475:1. (In the UK, 
which is seeing a vigorous popular backlash against "fat cat" pay 
packets, the ratio is 24:1).
               -- The Register


News | XML in Industry | Calendar | XML Registry
Marketplace | Resources | MyXML.org | Sponsors | Privacy Statement

Copyright 2001 XML.org. This site is hosted by OASIS