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[xsl] Entities in XML Schemas [OT?]

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Hello all,

I do not know if this is off topic for this list. If that is the case, then please direct me to the right place.

I would like to know how to make the equivalent of entities in schema, alternatively how to use entities as is in schemas.

Having an XML document somewhat like:

<doc>
<text>This is <Bold/>bold</Bold> text</text>
<text>Look at comment<Comment>Beware!</Comment> to be sure you have understood everything</text>
<text><Bold><Italic>Both bold and italic text</Italic></Bold></text>
</doc>

in DTD I would have something like:

<!-- snip -->
<!ENTITY % Inline "Bold|Italic|Uline|Comment;">
<!ELEMENT text (#PCDATA|%Inline;)*>
<!ELEMENT Bold (#PCDATA|%Inline;)*>
<!ELEMENT Italic (#PCDATA|%Inline;)*>
<!-- Snip -->

The entity contains numerous other types than those shown.

Now I at trying to convert to XML Schema, but I don't know how to do entities like this in schema.
I have Eric van der Vlist's XML Schema book, but have found no examples of this kind.

I want to be able to write something like:

<xsd:element name="text" minOccurs="0" maxOccurs="unbounded" type=???>
???
</xsd:element>

What to write in these places (marked with ???).
I would primarily like a solution where I do not have to write something like: Bold|Italic| ... a lot of times.

I hope that someone can help me with this.

Sincerely,
Ragulf Pickaxe :)

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