Relevant to applications using grammar specialisation. Sometimes, you will have defined multiple subdomains, but you will only be carrying out development in one of them. In this case, you can speed up EBL training by temporarily adding ignore\_\-subdomain declarations in the config file. An ignore\_\-subdomain declaration has the form \begin{verbatim} regulus_config(ignore_subdomain, <Tag>). \end{verbatim} The effect is to remove all references to $\langle$Tag$\rangle$ when performing training, and not build any specialised grammar for $\langle$Tag$\rangle$. You may include any number of ignore\_\-subdomain declarations.