Doc: specify aclitem syntax more clearly.

The previous wording here relied solely on an example to explain
aclitem output format.  Add an actual syntax synopsis and
explanation of the elements to make it clearer.

David Johnston and Tom Lane, per gripe from Eugen Konkov.

Discussion: https://postgr.es/m/170326116972.1876499.18357820037829248593@wrigleys.postgresql.org

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml
index e353e425e0083c581ac9cf364eb0500d0a1ccc6c..028bd9f8396d194552f79a5601a086790df7ab96 100644 (file)
--- a/doc/src/sgml/ddl.sgml
+++ b/doc/src/sgml/ddl.sgml
@@ -2280,9 +2280,16 @@ REVOKE ALL ON accounts FROM PUBLIC;
     <primary><type>aclitem</type></primary>
    </indexterm>
    The privileges that have been granted for a particular object are
-   displayed as a list of <type>aclitem</type> entries, where each
-   <type>aclitem</type> describes the permissions of one grantee that
-   have been granted by a particular grantor.  For example,
+   displayed as a list of <type>aclitem</type> entries, each having the
+   format:
+<synopsis>
+<replaceable>grantee</replaceable><literal>=</literal><replaceable>privilege-abbreviation</replaceable><optional><literal>*</literal></optional>...<literal>/</literal><replaceable>grantor</replaceable>
+</synopsis>
+   Each <type>aclitem</type> lists all the permissions of one grantee that
+   have been granted by a particular grantor.  Specific privileges are
+   represented by one-letter abbreviations from
+   <xref linkend="privilege-abbrevs-table"/>, with <literal>*</literal>
+   appended if the privilege was granted with grant option.  For example,
    <literal>calvin=r*w/hobbes</literal> specifies that the role
    <literal>calvin</literal> has the privilege
    <literal>SELECT</literal> (<literal>r</literal>) with grant option