Extending a template by inherit from a base one

Question

I have an LDAP schema objectClass that extends "inetOrgPerson" by just one extra attribute (mailAlternate), which works OK in openldap. Now would like to do the same with the corresponding phpLDAPadmin's XML template, but it looks like one has to keep explicitly all the parent's attributes plus the extra one... what a waste of bits ;-)

More generically, given this base template:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE template SYSTEM "template.dtd">

<template>
  <askcontainer>1</askcontainer>
  <description>New Base Object</description>
  <icon>address-book.png</icon>
  <invalid>0</invalid>
  <rdn>cn</rdn>
  <title>Base template</title>
  <visible>1</visible>

  <objectClasses>
    <objectClass id="baseTemplate"></objectClass>
  </objectClasses>

  <attributes>
    <attribute id="fooAttr">
      <display>Foo</display>
      <order>1</order>
      <page>1</page>
    </attribute>
  </attributes>

</template>

I'd like to extend it, kind of, with just a declaration of the extra attribute barAttr:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE template SYSTEM "template.dtd">

<template>
  <askcontainer>1</askcontainer>
  <description>New Extended Object (from Base)</description>
  <icon>address-book.png</icon>
  <invalid>0</invalid>
  <rdn>cn</rdn>
  <title>Base template</title>
  <visible>1</visible>

  <objectClasses>
    <!-- the first declaration is intended as "inherit from" -->
    <objectClass id="baseTemplate"></objectClass>
    <objectClass id="extendedBaseTemplate"></objectClass>
  </objectClasses>

  <attributes>
    <attribute id="barAttr">
      <display>Bar</display>
      <order>2</order>
      <page>1</page>
    </attribute>
  </attributes>

</template>

That above, unless I'm missing something, doesn't work: PLA just proposes the extra barAttr (fooAttr is missing) at creation of a new object.

So, does PLA actually supports template inheritance?