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Improve <xref> vs. <command> formatting in the documentation
SQL commands are generally marked up as <command>, except when a link to a reference page is used using <xref>. But the latter doesn't create monospace markup, so this looks strange especially when a paragraph contains a mix of links and non-links. We considered putting <command> in the <refentrytitle> on the target side, but that creates some formatting side effects elsewhere. Generally, it seems safer to solve this on the link source side. We can't put the <xref> inside the <command>; the DTD doesn't allow this. DocBook 5 would allow the <command> to have the linkend attribute itself, but we are not there yet. So to solve this for now, convert the <xref>s to <link> plus <command>. This gives the correct look and also gives some more flexibility what we can put into the link text (e.g., subcommands or other clauses). In the future, these could then be converted to DocBook 5 style. I haven't converted absolutely all xrefs to SQL command reference pages, only those where we care about the appearance of the link text or where it was otherwise appropriate to make the appearance match a bit better. Also in some cases, the links where repetitive, so in those cases the links where just removed and replaced by a plain <command>. In cases where we just want the link and don't specifically care about the generated link text (typically phrased "for further information see <xref ...>") the xref is kept. Reported-by: Dagfinn Ilmari Mannsåker <ilmari@ilmari.org> Discussion: https://www.postgresql.org/message-id/flat/87o8pco34z.fsf@wibble.ilmari.org
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@@ -57,7 +57,7 @@ CLUSTER [VERBOSE]
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<command>CLUSTER <replaceable class="parameter">table_name</replaceable></command>
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reclusters the table using the same index as before. You can also
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use the <literal>CLUSTER</literal> or <literal>SET WITHOUT CLUSTER</literal>
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forms of <xref linkend="sql-altertable"/> to set the index to be used for
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forms of <link linkend="sql-altertable"><command>ALTER TABLE</command></link> to set the index to be used for
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future cluster operations, or to clear any previous setting.
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</para>
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@@ -159,7 +159,7 @@ CLUSTER [VERBOSE]
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<para>
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Because the planner records statistics about the ordering of
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tables, it is advisable to run <xref linkend="sql-analyze"/>
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tables, it is advisable to run <link linkend="sql-analyze"><command>ANALYZE</command></link>
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on the newly clustered table.
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Otherwise, the planner might make poor choices of query plans.
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</para>
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