MarcXML documentation

Information on MarcXML can be found at The Library of Congress webiste.
Official documentation of MARC 21 and a full tag description is available here.
The table bellow contains description and examples for tags and sub-fields used in SCOAP³.

Tag	Indicator 1	Indicator 2	Subfield	Description	Accepted value	Mandatory	Repeatable	Notes	Example
001	-	-	-	SCOAP3 unique record ID	Integer	yes	no		2345
005	-	-	-	Last record modification time-stamp	Float (?)	yes	no		20150415013156.0
024	7	-		DOI identifier	-	yes	no		-
			2	Type of identifier	String	yes	no	In this case the value will always be "DOI"; This can be also used as unique identifier for the record	DOI
			a	IdentifieI	DOI format	yes	no		10.1088/1674-1137/38/6/063102
037	-	-		ArXiv identifier	String	no	yes		-
			2	Type of identifier	String	yes	no	In this case the value will always be "arXiv"	arXiv
			a	Identifier	arXiv ID format	yes	no		1308.1535
100	-	-		First author	-	no	yes	First author as seen in the metadata - first doesn't necesarily mean "main" author of a paper	-
			a	Name	String	yes	no	As in publisher's metadata (order?)	Doe, John
			v	Affiliation	String	no	yes	As in publisher's metadata	Yerevan Physics Institute, Yerevan, Armenia
			j	ORCID	ORCID format	no	no		ORCID:0000-0001-5000-2897
245	-	-		Title of a paper	-	yes	no		-
			a	The title	String + MathML	yes	no		Phase Transition of the Higher Dimensional Charged...
260	-	-		Publication information	-	yes	no		-
			b	Publisher's name	String	yes	no		Oxford University Press
			c	Date of publication	Date (yyyy-mm-dd)	yes	no		2015-03-01
300	-	-		Number of pages in PDF	-	no	no		-
			a	Number of pages	String/Integer	yes	no		9
520	-	-		Abstract	-	no	no		-
			a	Abstract	String + MathML + Latex	yes	no		-
540	-	-		License	-	yes	no		-
			a	License	String	yes	no		CC-BY-3.0
			u	URL to license documentation	URL	yes	no		http://creative.../by/3.0/
542	-	-		Copyrights	-	yes	no		-
			f	Copyrights	String	yes	no		The Authors
653	-	-		Keywords	-	no	yes		-
			9	Source	String	yes	no		Author
			a	Keyword	String	yes	no		higgs
700	-	-		Other author	-	no	yes	Author other than first; As in publisher's metadata.	-
			a	Name	String	yes	no		Doe, John
			v	Affiliation	String	no	yes		Yerevan Physics Institute, Yerevan, Armenia
			j	ORCID	ORCID format	no	no		ORCID:0000-0001-5000-2897
773	-	-		journal information	-	yes	no		-
			c	First-last page	String	no	no		1-3
			n	Issu number	Integer	no	no		1
			p	Journal name or abreviation	String	yes	no		Advances in High Energy Physics
			v	Volume	String	no	no		4
			y	Year	Integer	yes	no		2014
856	4	-		URL links to XML and fulltext files				URL links to XML and fulltext files (typically XML, PDF and/or PDF/a)	-
			s	Size in bytes	Integer	yes	no		2675
			u	URL	URL	yes	no		https://repo...fulltext.pdf subformat=pdfa
			x	Sub-format of a file	String	no	no	Used to distinguish PDF from PDF/A	pdf;pdf/a

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