= Appendix



[[xsd-schemas]]
== XML Schemas

This part of the appendix lists XML schemas for data access.



[[xsd-schemas-tx]]
=== The `tx` schema

The `tx` tags deal with configuring all of those beans in Spring's comprehensive support
for transactions. These tags are covered in the chapter entitled
<<data-access.adoc#transaction,Transaction Management>>.

[TIP]
====

You are strongly encouraged to look at the `'spring-tx.xsd'` file that ships with the
Spring distribution. This file is (of course), the XML Schema for Spring's transaction
configuration, and covers all of the various tags in the `tx` namespace, including
attribute defaults and suchlike. This file is documented inline, and thus the
information is not repeated here in the interests of adhering to the DRY (Don't Repeat
Yourself) principle.
====

In the interest of completeness, to use the tags in the `tx` schema, you need to have
the following preamble at the top of your Spring XML configuration file; the text in the
following snippet references the correct schema so that the tags in the `tx` namespace
are available to you.

[source,xml,indent=0]
[subs="verbatim,quotes"]
----
	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
			xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
			xmlns:aop="http://www.springframework.org/schema/aop"
			__xmlns:tx="http://www.springframework.org/schema/tx"__ xsi:schemaLocation="
			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
			__http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd__
			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->

	</beans>
----

[NOTE]
====
Often when using the tags in the `tx` namespace you will also be using the tags from the
`aop` namespace (since the declarative transaction support in Spring is implemented
using AOP). The above XML snippet contains the relevant lines needed to reference the
`aop` schema so that the tags in the `aop` namespace are available to you.
====



[[xsd-schemas-jdbc]]
=== The `jdbc` schema

The `jdbc` tags allow you to quickly configure an embedded database or initialize an
existing data source. These tags are documented in
<<data-access.adoc#jdbc-embedded-database-support,Embedded database support>>
and <<data-access.adoc#jdbc-initializing-datasource,Initializing a DataSource>> respectively.

To use the tags in the `jdbc` schema, you need to have the following preamble at the top
of your Spring XML configuration file; the text in the following snippet references the
correct schema so that the tags in the `jdbc` namespace are available to you.

[source,xml,indent=0]
[subs="verbatim,quotes"]
----
	<?xml version="1.0" encoding="UTF-8"?>
	<beans xmlns="http://www.springframework.org/schema/beans"
		xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
		__xmlns:jdbc="http://www.springframework.org/schema/jdbc"__ xsi:schemaLocation="
			http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
			__http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"__> <!-- bean definitions here -->

	</beans>
----