Writing a DTD: How to achieve this children setup

Posted by Boldewyn on Stack Overflow See other posts from Stack Overflow or by Boldewyn
Published on 2010-03-03T13:13:09Z Indexed on 2010/05/19 6:50 UTC
Read the original article Hit count: 245

Filed under:

dtd

|

element

|

children

|

order

The element tasklist may contain at most one title and at most one description, additionally any number (incl. 0) task elements in any order.

The naive approach is not applicable, since the order should not matter:

<!ELEMENT tasklist (title?, description?, task*) >

Alternatively, I could explicitly name all possible options:

(title, description?, task*) |
(title, task+, description?, task*) |
(task+, title, task*, description?, task*) |
(description, title?, task*) |
(description, task+, title?, task*) |
(task+, description, task*, title?, task*) |
(task*)

but then it's quite easy to write a non-deterministic rule, and furthermore it looks like the direct path to darkest madness. Any ideas, how this could be done more elegantly?

And no, an XSD or RelaxNG is no option. I need a plain, old DTD.

© Stack Overflow or respective owner

Related posts about dtd

XML Catalog file failing to resolve

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm using an OASIS v 1.1 compatible resolver (Norm Walsh's XMLResolver in conjunction with the catalog below. However, I'm pretty sure I've made some sort of obvious error here (this is the first time I've needed to use v 1.1 features) since attempting to resolve OxChapML.dtd fails. Can anyone see… >>> More
Extending XHTML

as seen on Stack Overflow - Search for 'Stack Overflow'
I'm playing around with writing a jQuery plugin that uses an attribute to define form validation behavior (yes, I'm aware there's already a validation plugin; this is as much a learning exercise as something I'll be using). Ideally, I'd like to have something like this: Example 1 - input: <input… >>> More
dtd vs xsd, which one to choose?

as seen on Stack Overflow - Search for 'Stack Overflow'
i want to use one of these to describe my xml document. i've read that xsd is better than the older dtd since it supports namespaces and data types. does this mean that i should only use xsd for all future needs and totally ignore dtd and don´t even have to bother learning its structure? >>> More
JiBX binding DTD schema in Eclipse

as seen on Stack Overflow - Search for 'Stack Overflow'
I have warnings in binding xml files: No grammar constraints (DTD or XML schema) detected for the document. I have done as is written in the answer here: http://stackoverflow.com/questions/982263/jibx-how-do-i-keep-using-interfaces-in-my-code (answer which is not accepted). But now I have an error… >>> More
php script to convert xml to dtd

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi all, Is there any PHP script to convert XML file to DTD. I tried a lot. I can able to find tools but can't PHP script. Is there any? any help will be thankful... Fero >>> More

Related posts about element

loading xml into SQL Server 2008 using sqlbulkload component

as seen on Stack Overflow - Search for 'Stack Overflow'
"Error: Schema: relationship expected on 'headerRecord'." I get the above error while load xml file to SQL Server 2008 using SQLXMLBulkLoad4 Component , the xml file contains Call Detail records, I have generated schema file from xml file using both , Dataset and XSD.exe tool, but the error remains… >>> More
:: Help Needed to parse ksoap response using J2ME ::

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi Guys, I am developing a mobile application using J2ME, LWUIT and KSOAP. The application makes .net webservice calls and fetches responses. I am able to successfully make calls and receive respone, but not able to parse the response, due to my limited knowledge in java. following is my WSDL file… >>> More
"img" elements: Block level element or inline element?

as seen on Stack Overflow - Search for 'Stack Overflow'
I've read somewhere that IMG elements behave like both. If correct, could someone please explain with examples? >>> More
validating an XML schema with empty attributes

as seen on Stack Overflow - Search for 'Stack Overflow'
I am having trouble validating my xml schema. I get these errors on the schema 113: 18 s4s-elt-invalid-content.1: The content of '#AnonType_user' is invalid. 164: 17 s4s-elt-invalid-content.1: The content of '#AnonType_festival' is invalid. Element 'sequence' is invalid, misplaced… >>> More
matching an element's class to another element's ID, or *part* of another element's ID

as seen on Stack Overflow - Search for 'Stack Overflow'
hello again Such a simple concept but I'm struggling to express it ... apologies in advance for my verbosity. I have a container div with a class, e.g., ; I want to use that class to do two things: add a class (e.g., 'active') to the nav element whose ID matches the class of div#container (e… >>> More