Bug w/ xsl:attribute-set in java xdk

Question

Hi - I found what seems to be a bug in the 9.0.0.2.0.0A xdk beta for java. In xsl, if you have an empty xsl:attribute-set (one that uses other attribute sets but does not define any of it's own), the XSL Processor gives an internal error. Adding an attribute to the set fixes the problem.
Example:
<xsl:attribute-set name="foo" use-attribute-sets="set1 set2"/>
Gives:
(Error) An internal error condition occurred. at oracle/xml/parser/v2/XSLProcessor.reportException (XSLProcessor.java:694) at oracle/xml/parser/v2/XSLProcessor.newXSLStylesheet (XSLProcessor.java:500) at oracle/xml/parser/v2/XSLStylesheet.<init>
Changing it to:
<xsl:attribute-set name="foo" use-attribute-sets="set1 set2">
<xsl:attribute name="bug"/>
</xsl:attribute-set>
Gives:
No error
Is this a bug or are you required to define at least one new attribute in every attribute set?
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Answer 1

correct typos:
I can't reproduce the error you got by defining the following stylesheet. Please let me know if anything I misunderstand.
XSL:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">
<xsl:attribute-set name="set1">
<xsl:attribute name="set1">good</xsl:attribute>
</xsl:attribute-set>
<xsl:attribute-set name="set2">
<xsl:attribute name="set2"/>
</xsl:attribute-set>
<xsl:attribute-set name="foo" use-attribute-sets="set1 set2">
</xsl:attribute-set>
<xsl:template match="/">
<out xsl:use-attribute-sets="foo">this is a try</out>
</xsl:template>
</xsl:stylesheet>
RESULT:
<?xml version = '1.0'?>
<out set1="good" set2="">this is a try</out>
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