• To: xml-dev@l...
• Subject: Constraining mixed content models
• From: Gregory Murphy <Gregory.Murphy@e...>
• Date: Mon, 1 Mar 2004 12:04:26 -0800 (PST)

Is there a schema language for XML that allows one to specify that an
element may have mixed content, but must not be empty or contain only
space characters? I would like to define a document type such that 

  <label>xxx</label>
  <label>x<y>x</y>x</label>
  <label><y/></label>

are valid, but

  <label></label>
  <label>   </label>

are not. 

// Gregory Murphy.  Isopaleocopria.

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