I'm assuming that your using the NOT NULL in the SQL sense.  This maps to 
schema's nillable feature.  In schema's case NOT NULL is the default.

I think xs:string (as a few variations of that) are the only types that you 
have to worry about having zero length.  Therefore, it sounds like you need 
to define a type of string that has minimum length one.  You may also need 
to define a pattern for it so that strings such as single spaces are not 
allowed.  For example:

    <xs:simpleType name="stringMin1">
        <xs:restriction base="xs:string">
            <xs:minLength value="1"/>
        </xs:restriction>
    </xs:simpleType>

Or:

    <xs:simpleType name="stringMin1">
        <xs:restriction base="xs:string">
            <xs:pattern value=".*\S.*"/>
        </xs:restriction>
    </xs:simpleType>

HTH,

Pete.
--
=============================================
Pete Cordell
Tech-Know-Ware Ltd
for XML to C++ data binding visit
http://www.tech-know-ware.com/lmx/
http://www.codalogic.com/lmx/
=============================================

----- Original Message ----- 
From: "Lev Lvovsky" <lists2@s...>
To: <xmlschema-dev@w...>
Sent: Monday, March 12, 2007 7:16 PM
Subject: equivalent of "NOT NULL" in schema?


>
> Hello, I'm new to Schema, so if this question is not appropriate for  this 
> list, please let me know.
>
> We're using SOAP to transfer data from one database to another.  I'm  in 
> the process of working out a Schema definition which allows us to 
> validated the SOAP response as much as possible before attempting  inserts 
> into the database.  I'm curious what the best way to define a  type which 
> implies "NOT NULL", specifically, that an element must  have at least one 
> character present for whatever data type it is.   Clearly this can be done 
> with multiple restrictions on minLength of a  simpleType, but is there any 
> way to "inherit" from a "not null" type  in the Schema to where a string 
> or integer simply uses that "not  null" type  as a base?  The goal being 
> to use the "minLength"  qualifier only once.
>
> Any help would be appreciated!
>
> thanks,
> -lev
>
> 



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