The User Guide has many "xref" elements with a "linkend" attribute. In almost
all cases, these appear to work fine. The ones which reference an id value
within the set of documents seem to all work fine. There is only one in the
entire document tree where the "linkend" attribute is a URL an external page,
not a reference to a page within the tree. This particular one is rendering
"???" in the PDF.
For instance, here is one of the many that appears to work fine:
------------------
<para><xref linkend="sec:build_phases"/> describes the phases of
every Gradle build.
------------------
Here is the one that is rendering "???":
----------------------------
See <xref
linkend="http://www.gradle.org/docs/current/userguide/tutorial_this_and_that.html#sec:configuring_using_external_script"/>
for more information.
----------------------------
I've verified that this URL is valid and exists. I imagine that "linkend"
isn't the correct attribute to use for a URL. What should be done here?
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