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<?xml version="1.0"?>
<!-- validity constraint check for Production 56(positive Test)-->
<!DOCTYPE tokenizer
[
<!ELEMENT tokenizer ANY>
<!ELEMENT a EMPTY>
<!ELEMENT b EMPTY>
<!ATTLIST a first ID #REQUIRED>
<!ATTLIST b second ID #REQUIRED>
]>
<tokenizer>
<a first = "AC1999"></a>
<b second = "CD345"></b>
This is a positive validity test for ID.
any element type has no more than one attribute of type ID specified
</tokenizer>
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