Bug 2955. Workaround for lack of atomic operations in GCCE standard libraries (fall back to default use of Mutex)
<?xml version="1.0"?>
<!-- Namespace name test: a syntactically plausible URI with a
fictitious scheme -->
<!DOCTYPE foo [
<!ELEMENT foo ANY>
<!ATTLIST foo xmlns CDATA #IMPLIED>
]>
<foo xmlns="zarquon://example.org/namespace"/>