Custom Views: Set style of text in custom HTML tags

hi all, I'm using an extended JEditorPane to render HTML containing custom tags e.g. <mytag>Text</mytag>
My ViewFactory dynamically loads a class based on the name of the tag to return the View for that tag. (The idea being you can add any tag, by just providing a View class to render it). It's working to the extent that I can use the View.paint() method to paint a square of text before and after the content element.
What I need to do is set the style (attributes) of the text contained in the custom tags. Is this possible?
A call to doc.setCharacterAttributes(startoffset, endoffset, attrs, true); from the View results in a "Attempt to mutate in notification", possibly because the HTMLDocument is locked at this time.
Any help/advice would be greatly appreciated.
Thanks.

I'll rephrase. Is it possible to change the HTMLDocument from a View object. Forgive my lack of understanding.

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I have a table containing clob column.
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4 just a test insert
5 just a test insert
9 <HTML>just a test insert</HTML>
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2 (p_rowid IN ROWID,
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20 /
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No errors.
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3 CTX_DDL.SET_ATTRIBUTE ('myfilter', 'PROCEDURE', 'myproc');
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7 END;
8 /
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4 ORDER BY score (1)
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