External entity declaration with empty system identifier treated as internal
entity ...
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Key: XERCESC-1763
URL: https://issues.apache.org/jira/browse/XERCESC-1763
Project: Xerces-C++
Issue Type: Bug
Components: Validating Parser (DTD)
Affects Versions: 2.8.0
Environment: This is likely to be platform-independent.
Reporter: Jacques Legare
Priority: Minor
An empty system identifier in an external entity declaration causes the entity
to be treated as internal. This appears to be because DTDScanner::scanEntityDef
() doesn't distinguish between a NULL pointer for the system identifier and the
first character of the system identifier being NULL.
Meanwhile, production [11] of Section 2.3 of the XML Specification states that
a system identifier can be empty. So, as best I can tell, the following
<!ENTITY foo SYSTEM "">
should be declarating an external entity.
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