Attribute types:
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String type: CDATA
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Tokenized type: ID, IDREF, IDREFS, ENTITY, ENTITIES
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Enumerated type: attribute can take only one of a list of values provided in the declaration
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Attribute defaults:
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required - forces the attribute to appear in the element (no default value)
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implied - the application supplies the default value
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fixed - can have only one value (specified)
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Declaration of `name' attribute for element `thing':
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<!ATTLIST thing name CDATA #REQUIRED>
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