Hi Folks,

Below is an excerpt of an XHTML document. It shows a <style> element. The content of the <style> element is printable ASCII text. I created this element declaration:

<xs:element name="style">
    <xs:simpleType>
        <xs:restriction base="xs:string">
            <xs:maxLength value="40000" />
            <xs:pattern value="[\s&#x20;-&#x7E;]*" />
        </xs:restriction>
    </xs:simpleType>
</xs:element>

But that is not sufficient. For my situation, a valid style element will not contain a <link> element inside the style element’s CDATA section. That is, if the style element is valid, the style element will not contain this:

<style>
    <![CDATA[
       <link href="" type="text/css" rel="stylesheet" />
      ...
      -->]]>
</style>

Is there a way in XML Schema 1.0 to express the restriction: The value of the style element is a string, excluding &lt;link?

Perhaps a pattern facet with a regex like this:

<xs:pattern value="[\s&#x20;-&#x7E;-[(&lt;link0]]*" />

However, that’s not a legal regex.

I can express the restriction using Schematron:

<sch:assert test="not(matches(normalize-space(.), '.*&lt;link.*', 'i'))">
    …
</sch:assert>

But I would rather do all checking in XML Schema if possible.

Also, I could implement the restriction in XML Schema 1.1 using an xs:assert, but I would rather use XML Schema 1.0 if possible.

Is it possible to express the restriction in XML Schema 1.0?  /Roger

Excerpt of an XHTML document

<style>
    <![CDATA[
      <!--
      /* Font Definitions */
      @font-face
      {
          font-family: "Cambria Math";
          panose-1: 2 4 5 3 5 4 6 3 2 4;
      }
      @font-face
      {
          font-family: Calibri;
          panose-1: 2 15 5 2 2 2 4 3 2 4;
      }
      /* Style Definitions */
      p.MsoNormal,
      li.MsoNormal,
      div.MsoNormal
      {
          margin: 0in;
          margin-bottom: .0001pt;
          font-size: 11.0pt;
          font-family: "Calibri", sans-serif;
      }
      a:link,
      span.MsoHyperlink
      {
          mso-style-priority: 99;
          color: #0563C1;
          text-decoration: underline;
      }
      a:visited,
      span.MsoHyperlinkFollowed
      {
          mso-style-priority: 99;
          color: #954F72;
          text-decoration: underline;
      }
      span.EmailStyle17
      {
          mso-style-type: personal-compose;
          font-family: "Calibri", sans-serif;
          color: windowtext;
      }
      .MsoChpDefault
      {
          mso-style-type: export-only;
          font-family: "Calibri", sans-serif;
      }
      @page WordSection1
       {
          size: 8.5in 11.0in;
          margin: 1.0in 1.0in 1.0in 1.0in;
      }
      div.WordSection1
      {
          page: WordSection1;
      }
      -->]]>
</style>