W3C schema 'if..then' for attributes

[shaun]

I should like to allow/disallow values for an attribute based on the
value of another attribute e.g if I have a document


<character name="snow white" sex="female" hatcolour=""/>
<character name="doc" sex="male" hatcolour="brown"/>


then this is valid. however

<character name="snow white" sex="female" hatcolour="green"/>

should be invalid. (in my story, female characters don't wear hats).

so I should like a schema which will allow hat colours green|brown|red
etc if the sex = 'male' but only allow the empty string for the hat
colour if the sex = 'female'.

is this possible in W3C schema?

cheers

shaun

 

[Soren Kuula]

I should like to allow/disallow values for an attribute based on the
value of another attribute e.g if I have a document

so I should like a schema which will allow hat colours green|brown|red
etc if the sex = 'male' but only allow the empty string for the hat
colour if the sex = 'female'.

is this possible in W3C schema?

No.

Soren

 

[Peter Flynn]

No.

Soren

So much for the "Expressiveness of XSDs".

///Peter

 

[shaun]

So much for the "Expressiveness of XSDs".

///Peter

so I cannot declare that the same element could have one of two types,
(dodgy pseudo code follows):

choice

element =" character" type= "female character constraints"
element="character" type="male character constraints"

/choice

???

 

[Peter Flynn]

so I cannot declare that the same element could have one of two types,
(dodgy pseudo code follows):

choice

element =" character" type= "female character constraints"
element="character" type="male character constraints"

/choice

Correct, you can't. But you can use markup to do what you want, and
you don't need anything so complex as a Schema:

<?xml version="1.0"?>
<!DOCTYPE characters [
<!ELEMENT characters (female|male)+>
<!ELEMENT female EMPTY>
<!ATTLIST female name CDATA #REQUIRED hat CDATA #FIXED "">
<!ELEMENT male EMPTY>
<!ATTLIST male name CDATA #REQUIRED hat (green|brown|red) #IMPLIED>
]>
<characters>
<female name="Snow White"/>
<male name="Doc" hat="brown"/>
</characters>

A validating parser will return a null value for the hat attribute for
all females.

///Peter