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Asked: 2026-05-13T17:20:49+00:00

I’m creating a DTD for an xml document. I have an Enumerated attribute for

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I’m creating a DTD for an xml document. I have an Enumerated attribute for an xml element. My question is: Can the attribute Type have spaces?

eg:

  <!ELEMENT Link (#PCDATA)>
  <!ATTLIST Link Type (Amendment|Reference|Superseded|Modified|
  Corrigendum|Corresponds|Endorsement|Equivalent|Identical|Modified|
  Not Equivalent|Note taken of|Related|Similar) "Reference">

So what I would like is:

  <Link Type="Not Equivalent" \>

But that seems to barf. When I say barf, I mean that when I try to validate the document (Eg Open it in a web browser) I get an error message:

Invalid character found in ATTLIST enumeration. Error processing
resource ‘file:///C:/myxmldocument.xml’. …

Is there some magic voodoo I need to do for spaces? Or is it just tough luck?

I looked in a few spots but couldn’t see any reference

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1 Answer

  1. Editorial Team

    The short answer is no. Xml attributes are name tokens and name tokens cannot contain spaces. The relevant specs are linked:

    Attributes

    Attribute Types (see NotationType)

    Names (See 4a – NameChar)

    The invalid character is the space. You can use ‘.’ or ‘-‘ as a separator if you like.

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