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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 fC<r 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 fC<r Philatelie.</Title>
</Item>
</List>
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