diff --git a/eo-compiler/pom.xml b/eo-compiler/pom.xml
index 927b4e5f2b..2be757154e 100644
--- a/eo-compiler/pom.xml
+++ b/eo-compiler/pom.xml
@@ -73,6 +73,7 @@ SOFTWARE.
     <dependency>
       <groupId>com.jcabi</groupId>
       <artifactId>jcabi-matchers</artifactId>
+      <scope>test</scope>
     </dependency>
     <dependency>
       <groupId>com.google.code.findbugs</groupId>
diff --git a/eo-compiler/src/main/antlr4/org/eolang/compiler/Program.g4 b/eo-compiler/src/main/antlr4/org/eolang/compiler/Program.g4
index feb16fc720..56c009ac13 100644
--- a/eo-compiler/src/main/antlr4/org/eolang/compiler/Program.g4
+++ b/eo-compiler/src/main/antlr4/org/eolang/compiler/Program.g4
@@ -210,14 +210,14 @@ EOL
   }
   ;
 
-NAME: LO (LETTER | DIGIT)*;
-
 BOOL: 'true' | 'false';
 CHAR: '\'' (LETTER | DIGIT) '\'';
 STRING: '"' ('\\"' | ~'"')* '"';
 INTEGER: (PLUS | MINUS)? DIGIT+;
 FLOAT: (PLUS | MINUS)? DIGIT+ DOT DIGIT+;
-HEX: '0x' DIGIT+;
+HEX: '0x' (DIGIT | 'a'..'f')+;
+
+NAME: LO (LETTER | DIGIT)*;
 
 LETTER: (HI | LO);
 HI: [A-Z];
diff --git a/eo-compiler/src/test/resources/org/eolang/compiler/packs/full-syntax.yaml b/eo-compiler/src/test/resources/org/eolang/compiler/packs/full-syntax.yaml
index 05844ad6c5..ddee222fcb 100644
--- a/eo-compiler/src/test/resources/org/eolang/compiler/packs/full-syntax.yaml
+++ b/eo-compiler/src/test/resources/org/eolang/compiler/packs/full-syntax.yaml
@@ -1,6 +1,11 @@
 xsls: []
 tests:
   - /program/objects[count(o)=5]
+  - //o[@base='bool']
+  - //o[@base='string']
+  - //o[@base='char']
+  - //o[@base='float']
+  - //o[@base='hex']
 eo: |
   # The purpose of this test case is to make
   # sure all possible syntax scenarios can
@@ -19,7 +24,7 @@ eo: |
     second > hello
       third:foo > x
         f 12 false
-          (((t 22) r:t 8.54 "yes" 'e').print 88):hey true > !a
+          (((t 22) r:t 8.54 "yes" 'e').print 88 0x1f):hey true > !a
             kid
       f:u
         z
diff --git a/eo-maven-plugin/src/main/java/org/eolang/maven/CompileMojo.java b/eo-maven-plugin/src/main/java/org/eolang/maven/CompileMojo.java
index 34dc80d585..30fccf22bc 100644
--- a/eo-maven-plugin/src/main/java/org/eolang/maven/CompileMojo.java
+++ b/eo-maven-plugin/src/main/java/org/eolang/maven/CompileMojo.java
@@ -30,6 +30,7 @@
 import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.ArrayList;
 import org.apache.maven.plugin.AbstractMojo;
 import org.apache.maven.plugin.MojoFailureException;
 import org.apache.maven.plugins.annotations.LifecyclePhase;
@@ -138,12 +139,32 @@ public void execute() throws MojoFailureException {
      * @param file EO file
      */
     private void compile(final Path file) {
+        final String name = file.toString().substring(
+            this.sourcesDirectory.toString().length() + 1
+        );
         try {
             final ByteArrayOutputStream baos = new ByteArrayOutputStream();
             new Program(
-                file.toString().substring(
-                    this.sourcesDirectory.toString().length() + 1
-                ),
+                name,
+                new InputOf(file),
+                new OutputTo(baos)
+            ).compile(new ArrayList<>(0));
+            final String xml = String.format("%s.xml", name);
+            new IoChecked<>(
+                new LengthOf(
+                    new TeeInput(
+                        new InputOf(baos.toString()),
+                        new OutputTo(
+                            this.targetDir.toPath()
+                                .resolve("eo-compiler-raw")
+                                .resolve(xml)
+                        )
+                    )
+                )
+            ).value();
+            baos.reset();
+            new Program(
+                name,
                 new InputOf(file),
                 new OutputTo(baos)
             ).compile();
@@ -154,12 +175,7 @@ private void compile(final Path file) {
                         new OutputTo(
                             this.targetDir.toPath()
                                 .resolve("eo-compiler")
-                                .resolve(
-                                    String.format(
-                                        "%s.xml",
-                                        file.getFileName().toString()
-                                    )
-                                )
+                                .resolve(xml)
                         )
                     )
                 )
diff --git a/eo-maven-plugin/src/main/resources/org/eolang/maven/to-java.xsl b/eo-maven-plugin/src/main/resources/org/eolang/maven/to-java.xsl
index e45aed9c59..9abd2cd77f 100644
--- a/eo-maven-plugin/src/main/resources/org/eolang/maven/to-java.xsl
+++ b/eo-maven-plugin/src/main/resources/org/eolang/maven/to-java.xsl
@@ -50,6 +50,12 @@ SOFTWARE.
         <xsl:value-of select="$EOL"/>
         <xsl:text> * your changes will be discarded on the next build.</xsl:text>
         <xsl:value-of select="$EOL"/>
+        <xsl:text> * The sources were compiled to XML on </xsl:text>
+        <xsl:value-of select="/program/@time"/>
+        <xsl:text> by the compiler v.</xsl:text>
+        <xsl:value-of select="/program/@version"/>
+        <xsl:text>.</xsl:text>
+        <xsl:value-of select="$EOL"/>
         <xsl:text> */</xsl:text>
         <xsl:value-of select="$EOL"/>
         <xsl:value-of select="$EOL"/>