Re: vCard XML DTD comments 03

Randal Leavitt wrote:

"I am still perplexed about several attributes, (e.g. del.type, tel.type,
email.type) which are specified as "NMTOKENS".  It seems to me that
child empty elements should be used instead.  This will allow parsers to
validate them, and will allow any combination of values to be present or
absent."

The DTD design for vCard revolves around a number of design points.

- vCard DTD needs to be a functional equivalent to the MIME Directory
profile.

- The format types for the delivery address, telephone and email were
mapped into attributes because as PCDATA, there would be no way to
"validate" the values of the attributes.

- In the event that non-standard "X-" types are defined in the vCard
document, you need to declare these for the recipient. Making them
attributes with a NMTOKENS or NMTOKEN value type will provide for this.

- - Frank Dawson