Edit Data Access part of the reference documentation

I edited the Data Access chapter for spelling, punctuation,
grammar, usage, corporate voice, and clarity.

I also added links and cross-references.

src/docs/asciidoc/data-access-appendix.adoc

@@ -5,33 +5,34 @@
 [[xsd-schemas]]
 == XML Schemas
 
-This part of the appendix lists XML schemas for data access.
+This part of the appendix lists XML schemas for data access, including the following:
+
+* <<xsd-schemas-tx>>
+* <<xsd-schemas-jdbc>>
 
 
 
 [[xsd-schemas-tx]]
-=== The `tx` schema
+=== 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
+TIP: We strongly encourag you to look at the `'spring-tx.xsd'` file that ships with the
+Spring distribution. This file contains the XML Schema for Spring's transaction
+configuration and covers all of the various elements in the `tx` namespace, including
+attribute defaults and similar information. 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
+In the interest of completeness, to use the elements 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.
+are available to you:
 
+====
 [source,xml,indent=0]
 [subs="verbatim,quotes"]
 ----
@@ -39,45 +40,49 @@ are available to you.
 	<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="
+			xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation=" <1>
 			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/tx http://www.springframework.org/schema/tx/spring-tx.xsd <2>
 			http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- bean definitions here -->
 
 	</beans>
 ----
-
-[NOTE]
+<1> Specify the namespace.
+<2> Specify the location (with other schema locations).
 ====
-Often when using the tags in the `tx` namespace you will also be using the tags from the
+
+NOTE: Often, when you use the elements in the `tx` namespace, you are also using the elements 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.
-====
+by using AOP). The preceding XML snippet contains the relevant lines needed to reference the
+`aop` schema so that the elements in the `aop` namespace are available to you.
 
 
 
 [[xsd-schemas-jdbc]]
-=== The `jdbc` schema
+=== 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.
+The `jdbc` elements let you quickly configure an embedded database or initialize an
+existing data source. These elements 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.
+To use the elements 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 elements 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="
+		xmlns:jdbc="http://www.springframework.org/schema/jdbc" xsi:schemaLocation=" <2>
 			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 -->
+			http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc.xsd"> <!-- bean definitions here --> <2>
 
 	</beans>
 ----
+<1> Specify the namespace.
+<2> Specify the location (with other schema locations).
+====