> + same level are considerd to be <firstterm>siblings</firstterm>,
considered > + <productname>PostgreSQL</productname> specific functions detailed in postgresql hyphen specific (as in the original) These would all be easier to read with commas: + <parameter>expression</parameter> is NULL an + If <literal>WITH UNIQUE</literal> is specified the + If the input is NULL an SQL NULL is returned. If the input is a number + If <literal>WITH UNIQUE</literal> is specified there must not + is <literal>strict</literal> an error is generated if it yields no items. There's a few instances of "space space" that could be condensed: + <function>json_scalar</function> functions, this needs to be either <type>json</type> or + which must be a SELECT query returning a single column. If
