Bug report: Oracle schema parser/regex compiler failing valid xs:patterns

Question

Hello,
The Oracle schema regex compiler does not allow valid patterns with more than a certain number of branches. An XSDException is thrown, namely 'invalid facet 'pattern' in element 'simpleType'.
I have also tried using multiple <xs:pattern> elements, which also conforms to the official schema specification, but no luck there either.
Here are my sample regexs which validate correctly against all branch examples in XML Spy 4.0:
<!-- as single multi branchpattern-->
<xs:pattern value="aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|purple|red|silver|teal|white|yellow|[A-Za-z]{1,2}[0-9]{2,4}|rgb\([0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1}\)"/>
<!-- as multiple patterns-->
<xs:pattern value="aqua|black|blue|fuchsia|gray|green|lime|maroon"/>
<xs:pattern value="navy|olive|purple|red|silver|teal|white|yellow"/>
<xs:pattern value="[A-Za-z]{1,2}[0-9]{2,4}"/>
<xs:pattern value="rgb\([0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1}\)"/>
(Note that the Oracle regex compiler will allow any one of these patterns, it is only when the compiler concatenates them as per the spec that the exception is thrown.)
Here are the W3 specifications for patterns/schema regex, which impose no limit on pattern branches whether they are part of one or multiple xs:pattern 'value' attributes:
(http://www.w3.org/TR/xmlschema-2/#regexs)
[Definition:] A regular expression is composed from zero or more ·branch·es, separated by | characters.
[Definition:] A branch consists of zero or more ·piece·s, concatenated together.
(http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/datatypes.html#rf-pattern)
Schema Representation Constraint: Multiple patterns
If multiple <pattern> element information items appear as [children] of a <simpleType>, the [value]s should be combined as if they appeared in a single ·regular expression· as separate ·branch·es.
NOTE: It is a consequence of the schema representation constraint Multiple patterns (§4.3.4.3) and of the rules for ·restriction· that ·pattern· facets specified on the same step in a type derivation are ORed together, while ·pattern· facets specified on different steps of a type derivation are ANDed together.
Thus, to impose two ·pattern· constraints simultaneously, schema authors may either write a single ·pattern· which expresses the intersection of the two ·pattern·s they wish to impose, or define each ·pattern· on a separate type derivation step.
Many thanks
Kevin Smith

Answer 1

Hello,
The Oracle schema regex compiler does not allow valid patterns with more than a certain number of branches. An XSDException is thrown, namely 'invalid facet 'pattern' in element 'simpleType'.
I have also tried using multiple <xs:pattern> elements, which also conforms to the official schema specification, but no luck there either.
Here are my sample regexs which validate correctly against all branch examples in XML Spy 4.0:
<!-- as single multi branchpattern-->
<xs:pattern value="aqua|black|blue|fuchsia|gray|green|lime|maroon|navy|olive|purple|red|silver|teal|white|yellow|[A-Za-z]{1,2}[0-9]{2,4}|rgb\([0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1}\)"/>
<!-- as multiple patterns-->
<xs:pattern value="aqua|black|blue|fuchsia|gray|green|lime|maroon"/>
<xs:pattern value="navy|olive|purple|red|silver|teal|white|yellow"/>
<xs:pattern value="[A-Za-z]{1,2}[0-9]{2,4}"/>
<xs:pattern value="rgb\([0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1},[0-9]{1,3}%{0,1}\)"/>
(Note that the Oracle regex compiler will allow any one of these patterns, it is only when the compiler concatenates them as per the spec that the exception is thrown.)
Here are the W3 specifications for patterns/schema regex, which impose no limit on pattern branches whether they are part of one or multiple xs:pattern 'value' attributes:
(http://www.w3.org/TR/xmlschema-2/#regexs)
[Definition:] A regular expression is composed from zero or more ·branch·es, separated by | characters.
[Definition:] A branch consists of zero or more ·piece·s, concatenated together.
(http://www.w3.org/TR/2001/REC-xmlschema-2-20010502/datatypes.html#rf-pattern)
Schema Representation Constraint: Multiple patterns
If multiple <pattern> element information items appear as [children] of a <simpleType>, the [value]s should be combined as if they appeared in a single ·regular expression· as separate ·branch·es.
NOTE: It is a consequence of the schema representation constraint Multiple patterns (§4.3.4.3) and of the rules for ·restriction· that ·pattern· facets specified on the same step in a type derivation are ORed together, while ·pattern· facets specified on different steps of a type derivation are ANDed together.
Thus, to impose two ·pattern· constraints simultaneously, schema authors may either write a single ·pattern· which expresses the intersection of the two ·pattern·s they wish to impose, or define each ·pattern· on a separate type derivation step.
Many thanks
Kevin Smith