references with a few titles conversion

[Intelligent2013]

Source: https://github.com/metanorma/mn-samples-bsi/issues/2
MN XML:

<references id="sec_bibl">
<title>Bibliography</title>
<title>
<strong>Standards publications</strong>
</title>
<p>For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.</p>
<bibitem id="ref_23" type="standard">
<eref citeas="BS 476‑22" type="inline">, <title>Fire tests on building materials and structures – Part 22: Method for determination of the fire resistance of non‑loadbearing elements of construction</title>
</eref>
</bibitem>
<bibitem id="ref_24" type="standard">
<eref citeas="BS 5266‑1" type="inline">, <title>Emergency lighting – Part 1: Code of practice for the emergency lighting of premises</title>
</eref>
</bibitem>
...
<title>
<strong>Other publications</strong>
</title>
<bibitem id="ref_31">
<docidentifier type="metanorma">[1]</docidentifier>
<title>GREAT BRITAIN. Building Regulations 2010 (SI No. 2214 2010) and subsequent amendments. London: The Stationery Office.</title>
</bibitem>
<bibitem id="ref_32">
<docidentifier type="metanorma">[2]</docidentifier>
<title>GREAT BRITAIN. Building Regulations (Northern Ireland) 2012 (SRNI No. 192 2012) and subsequent amendments. Belfast: The Stationery Office.</title>
</bibitem>
...
<title>
<strong>Further reading</strong>
</title>
<bibitem id="ref_45" type="standard">
<eref citeas="BS EN ISO 9001" type="inline">, <title>Quality systems – Requirements</title>
</eref>
</bibitem>
</references>
</bibliography>

In resulted STS XML there aren't sub-sections ref-list Other publications, Further reading:

<ref-list content-type="bibl" id="sec_bibl">
<title>Bibliography</title>
<ref-list>
<title>
<bold>Standards publications</bold>
</title>
<p>For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.</p>
<ref content-type="standard" id="ref_23">
<std type="undated">
<std-ref>BS 476‑22</std-ref>, <title>Fire tests on building materials and structures – Part 22: Method for determination of the fire resistance of non‑loadbearing elements of construction</title>
</std>
</ref>
<ref content-type="standard" id="ref_24">
<std type="undated">
<std-ref>BS 5266‑1</std-ref>, <title>Emergency lighting – Part 1: Code of practice for the emergency lighting of premises</title>
</std>
</ref>
...
<ref content-type="standard" id="ref_45">
<std type="undated">
<std-ref>BS EN ISO 9001</std-ref>, <title>Quality systems – Requirements</title>
</std>
</ref>
</ref-list>
...

[Intelligent2013]

Done.