Consider Salhani metadata

The Salhani teiHeader has a structure different from the other text sources since it's a printed text, not a manuscript.

The metadata in focus looks like the following:

<sourceDesc>
    <biblStruct>
        <analytic>
            <title level="a" type="main">XX Title of the section/manuscript/... 
               as can be obtained from the monography XX</title>
        </analytic>
        <monogr>
            <editor>…</editor>
            <title level="m" type="main">…</title>
            <title level="m" type="alt">…</title>
            <imprint>
                <publisher>…</publisher>
                <pubPlace>–</pubPlace>
                <date>–</date>
                <biblScope>XX–YY</biblScope>
            </imprint>
        </monogr>
    </biblStruct>
</sourceDesc>

This has to be considered when we extract the metadata for the TextAPI.

Cf. #81 (closed)