diff options
Diffstat (limited to 'doc/src/sgml/extend.sgml')
| -rw-r--r-- | doc/src/sgml/extend.sgml | 14 |
1 files changed, 7 insertions, 7 deletions
diff --git a/doc/src/sgml/extend.sgml b/doc/src/sgml/extend.sgml index 2e8f77cf4f..246451a42e 100644 --- a/doc/src/sgml/extend.sgml +++ b/doc/src/sgml/extend.sgml @@ -9,7 +9,7 @@ <para> In the sections that follow, we will discuss how you - can extend the <productname>PostgreSQL</productname> + can extend the <productname>PostgreSQL</productname> <acronym>SQL</acronym> query language by adding: <itemizedlist spacing="compact" mark="bullet"> @@ -45,8 +45,8 @@ <title>How Extensibility Works</title> <para> - <productname>PostgreSQL</productname> is extensible because its operation is - catalog-driven. If you are familiar with standard + <productname>PostgreSQL</productname> is extensible because its operation is + catalog-driven. If you are familiar with standard relational database systems, you know that they store information about databases, tables, columns, etc., in what are commonly known as system catalogs. (Some systems call @@ -54,14 +54,14 @@ user as tables like any other, but the <acronym>DBMS</acronym> stores its internal bookkeeping in them. One key difference between <productname>PostgreSQL</productname> and standard relational database systems is - that <productname>PostgreSQL</productname> stores much more information in its + that <productname>PostgreSQL</productname> stores much more information in its catalogs: not only information about tables and columns, but also information about data types, functions, access methods, and so on. These tables can be modified by - the user, and since <productname>PostgreSQL</productname> bases its operation + the user, and since <productname>PostgreSQL</productname> bases its operation on these tables, this means that <productname>PostgreSQL</productname> can be extended by users. By comparison, conventional - database systems can only be extended by changing hardcoded + database systems can only be extended by changing hardcoded procedures in the source code or by loading modules specially written by the <acronym>DBMS</acronym> vendor. </para> @@ -209,7 +209,7 @@ parsed. Each position (either argument or return value) declared as <type>anyelement</type> is allowed to have any specific actual data type, but in any given call they must all be the - <emphasis>same</emphasis> actual type. Each + <emphasis>same</emphasis> actual type. Each position declared as <type>anyarray</type> can have any array data type, but similarly they must all be the same type. If there are positions declared <type>anyarray</type> and others declared |