mathieu wrote:
> On Aug 10, 6:19 pm, "Steve W. Jackson" <stevewjack...@knology.net>
> wrote:
>> In article
>> <10e1b9c8-e9d5-4c55-8fe1-badbb86fe...@d23g2000vbm.googlegroups.com>,
>>
>>  mathieu <mathieu.malate...@gmail.com> wrote:
>>> Hi there,
>>>   I am looking at a way to express dynamic in XML. For example let say
>>> I have :
>>> ...
>>> <person name="John Doe" Age="30">
>>> ...
>>>   How can I say that every year Age should be increased by 1 ? Has
>>> anyone work on integrating language and storing it as XML ?
>>> thanks
>> A person's date of birth doesn't change.  Include that and then the
>> "age" information will always be accurate when calculated from a
>> specified date.
> 
> Excellent. So I now have:
> 
> <person name="John Doe" Bday="197001001">

I suggest a more standard date format, for instance 1970-01-01 (yyyy-mm-dd)

> How do I express the rule Age is computed from Bday using current
> date ?

I suggest you programmatically do that in whatever program will ever use 
your XML as input. XML is meant to represent, and therefore exchange, 
data. It is rarely meant to apply data computing.

> I am looking at MathML, but it is missing a for-each which may
> come handy when I'd like to define more complex rules.

As far as I know MathML's purpose is to represent mathematic formulas, 
not to calculate them.
In other words it is a method to put math sentences in a web page or 
likewise, it is not a programming language.
In other other words, MathML is not what you're looking for.

It seems to me you are trying to use XML as a programming language, 
which is rarely meant to be, aside from XSL transformation (which is not 
meant for the kind of programming you want to do.)

> Are RuleML and SMRL being used ?

Can't comment on these, don't know them.

--
Mayeul