Labels must not include any space. Use the following prefixes to name labels:
Section: sec:
Subsection: ssec:
Subsubsection: sssec:
Tables (including sub-tables): tab:
Figures (including sub-figures): fig:
Algorithms: alg:
Here are a few examples:
The label of the introduction section → sec:introduction
The label of a subsection describing a decoding strategy → ssec:decoding-strategy
The label of the table showing data statistics → tab:data-stats