I have two XML files, File 1 and File 2. They contain the XML shown below.
<Tag>852</Tag> in File 1 has a @crawford-number. If in File 2 there is
an <Item> with a <Shelfmark> equal to the value of @crawford-number, I
want to add an @pdf-number attribute to the <Tag>852</Tag> in File 1
containing the value of <PDF> in File 2 like so:
<Tag crawford-number="Crawford 2411." @pdf-number="016678286">852</Tag>
File 1 always contains a <Tag @crawford>852</Tag> and File 2 always
contains a <Shelfmark>, but there may or may not be a match.
I have not a clue as to how to get started. Happy to answer any questions.
Mark
FILE 1:
<List>
<Record>
<Field>
<Tag>245</Tag>
<Data>General-Anzeiger für Philatelie.$bInternationales
Insertions- Organ.</Data>
</Field>
<Field>
<Tag crawford-number="Crawford 2411.">852</Tag>
<Data>No.1-800. 10 Apr. 1883-15 Jan. 1913$aBritish
Library$b5$cDPB$jCrawford
2411.$nxxk</Data>
</Field>
</Record>
</List>
File 2:
<List>
<Item>
<PDF>016678286</PDF>
<Shelfmark>Crawford 2411.</Shelfmark>
<Title>General-Anzeiger für Philatelie.</Title>
</Item>
</List>
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