/**
* Aliases the given field's name with the given <code>alias</code>. The given alias must not be
* non-null, not-empty and must not contain illegal characters w.r.t. the XML format.
*
* @param f to alias
* @param alias the alias to set
* @return the previous alias, if any, or null
* @throws IllegalArgumentException if alias contains invalid XML chars
* @throws IllegalStateException if shared configuration
*/
public String alias(Field f, String alias) {
XMLUtil.validateAlias(alias);
this.checkNotSharedConfiguration();
return this.aliasing.put(f, alias);
}
