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XSD datatypes

Jason S
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I'm using RELAX NG but my question is about XSD datatypes. Is there
any way to combine patterns? Right now I have this: (a chain of
identifiers, the first being strict e.g. starting w/ letter or
understore, the rest can be letters, numbers or underscore, the
separator being a '.')

<define name='identifier-chain'>
<data type="token">
<param name="pattern">([A-Za-z_][A-Za-z_0-9]*)(\.[A-Za-

is there any way to break this up into sub-patterns?

<define name='identifier'>
<data type="token">
<param name="pattern">[A-Za-z_][A-Za-z_0-9]*</param>
<define name='secondary-identifier'>
<data type="token">
<param name="pattern">[A-Za-z_0-9]+</param>
<define name='identifier-chain'>
<ref name='identifier' />
<data type="token">
<ref name='secondary-identifier' />
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