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	This adds a new psql command \bind that sets query parameters and
causes the next query to be sent using the extended query protocol.
Example:
    SELECT $1, $2 \bind 'foo' 'bar' \g
This may be useful for psql scripting, but one of the main purposes is
also to be able to test various aspects of the extended query protocol
from psql and to write tests more easily.
Reviewed-by: Corey Huinker <corey.huinker@gmail.com>
Discussion: https://www.postgresql.org/message-id/flat/e8dd1cd5-0e04-3598-0518-a605159fe314@enterprisedb.com
		
	
<!-- doc/src/sgml/README.links -->
Linking within DocBook documents can be confusing, so here is a summary:
Intra-document Linking
----------------------
<xref>
	use to get chapter/section number from the title of the target
	link, or xreflabel if defined at the target, or refentrytitle if target
        is a refentry;  has no close tag
	http://www.oasis-open.org/docbook/documentation/reference/html/xref.html
linkend=
	controls the target of the link/xref, required
endterm=
	for <xref>, allows the text of the link/xref to be taken from a
	different link target title
<link>
	use to supply text for the link, only uses linkend, requires </link>
	http://www.oasis-open.org/docbook/documentation/reference/html/link.html
	can be embedded inside of <command>, unlike <xref>
External Linking
----------------
<ulink>
	like <link>, but uses a URL (not a document target);  requires
	</ulink>; if no text is specified, the URL appears as the link
	text
	http://www.oasis-open.org/docbook/documentation/reference/html/ulink.html
url=
	used by <ulink> to specify the URL, required
Guidelines
----------
- For an internal link, if you want to supply text, use <link>, else
  <xref>.
- Specific nouns like GUC variables, SQL commands, and contrib modules
  usually have xreflabels.
- For an external link, use <ulink>, with or without link text.
- xreflabels added to tags prevent the chapter/section for id's from being
  referenced;  only the xreflabel is accessible.  Therefore, use xreflabels
  only when linking is common, and chapter/section information is unneeded.