Alessandro A. Garbagnati
You can find the answer by reading the notes at the end of the Tomcat download page
Apache Tomcat 4.1.x
This release of Tomcat 4.1.x is available in two different packaging options:
- Standard: This is a full binary distrbution of Tomcat 4, which includes all optional libraries and an XML parser (Xerces 2.0.1), and can be run on JDK 1.2+.
- JDK 1.4 LE: This is a lightweight binary distribution of Tomcat 4, designed to be run on JDK 1.4. It does not include any of the optional binaries or the necessary XML parser (which is included in JDK 1.4). This build can be run on JDK 1.2+ by adding an XML parser. All the components of this distribution are open source software. This package does not contain JavaMail, Java Activation Framework, Xerces, JNDI or the JDBC Standard Extension.