labels separated by dots, for example <literal>L1.L2.L3</>, representing

a path from the root of a hierarchical tree to a particular node. The

length of a label path must be less than 65kB, but keeping it under 2kB is

preferable. In practice this is not a major limitation; for example,

the longest label path in the DMOZ catalog (<ulink

url="http://www.dmoztools.net"></ulink>) is about 271 bytes.

preferable.

</para>

<para>