On Mar 10, 2004, at 8:56 AM, [EMAIL PROTECTED] wrote:
Example (readers familiar with the problem may skip this): <salutation>Dear Mr.<name>Robert Smith</name>.</salutation>
This structure is represented by the XML Schema
<xsd:element name="salutation"> <xsd:complexType mixed="true"> <xsd:sequence> <xsd:element name="name" type="xsd:string"/> </xsd:sequence> </xsd:complexType> </xsd:element>
How would you represent this in Haskell? A first idea may be to store the enclosing strings:
data Salutation = Salutation String Name String
This approach is not scaling well. E.g., there may be multiple names in the text...
No, according to the content model, there must be exactly one occurrence of "name" in the content of "salutation": not zero, and not more than one. To allow zero or more you need to add minOccurs and/or maxOccurs attributes. This is one of the ways that mixed content in XML Schema differs from that in DTD's, and is treated in the references Johan posted.
So, on the contrary, your first declaration:
data Salutation = Salutation String Name String
is a better translation of this schema (fragment), than your second attempt:
data Salutation' = Salutation' [Either Char Name]
Regards, Frank
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