XSpec occupies x: namespace prefix

[AirQuick]

XSpec (Note t and x namespace prefixes.)

<?xml version="1.0" encoding="UTF-8"?>
<t:description query="x-urn:test:do-nothing" query-at="do-nothing.xquery"
	stylesheet="do-nothing.xsl" xmlns:do-nothing="x-urn:test:do-nothing"
	xmlns:t="http://www.jenitennison.com/xslt/xspec" xmlns:x="my-namespace">
	<t:scenario label="Using x: prefix in user-content">
		<t:call function="name">
			<t:param>
				<x:element />
			</t:param>
		</t:call>
		<t:expect label="should be possible" select="'x:element'" />
	</t:scenario>
</t:description>

XSLT

...
Creating Test Stylesheet...
...
Cannot create two namespace nodes with the same prefix mapped to different URIs (prefix=x, URI=my-namespace, URI=http://www.jenitennison.com/xslt/xspec)

*** Error compiling the test suite

XQuery

...
Running Tests...
Static error on line 30 column 50 of test.xq:
  XPST0008: Variable $t:result has not been declared
Static error on line 1 column 22 of test.xq:
  XPST0008: Variable $local:successful has not been declared
Static error(s) in query

*** Error running the test suite

[AirQuick]

x: shouldn't be hardcoded. (expath#24 (comment))