ucid, mxw-id, load-source

See Common XML Attributes.

appl-type

Single-digit number which indicates the type of patent.

This attribute is populated for AU records (1900-present) and US records (1976-2000) only.

AU values include: 

0=Standard
1=Petty
2=Innovation
3=Provisional

US values include: 

1=Utility
2=Reissue
4=Design
5=Defensive Publication
6=Plant
7=Statutory Invention Registration

us-art-unit

Identifies a group of examiners who specialize in a specific technology or art (US Only)

us-series-code

Two-digit number (leading zero removed). For a detailed review of time periods, see Filing Years and Patent Application Serial Numbers and Application Number and Filing Receipt (US Only)

is-representative

Indicates whether the document is the family representative in the EPO simple family. Optional, YESlNO.

format

Designates the normalized or not-normalized format of the following document-id. 
epo=the standardized DOCDB format
original=the unparsed format directly from the data source

country

Country is represented by a standard 2-character code based on WIPO ST.3. In the case of WO publications, the country is the authority where the application was filed.

doc-number

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doc-number is provided in both DOCDB-normalized format and in the format provided by the publishing patent office. DOCDB-normalized format usually includes the filing year (2 or 4 digits) at the beginning or end unless the year is already embedded in the application number.

• US application numbers in DOCDB format have changed since late 2010 (beginning of series code 13, see link below for more details). USPTO "original" format always includes a prepended series code. 
• WO application numbers are formatted with a 2-digit year followed by a 5-digit serial number prior to 2004-01-01. Beginning with application dates in 2004, the format is 4-digit year followed by 6-digit serial number (e.g. 9813495 or 2004000001). A kind code of "W" must be used to distinguish WO applications from national office applications.
• JP application numbers include a 2-digit year as suffix until 2000; thereafter the 4-digit year is prepended (e.g. 131699 or 2007000849). 

For a complete discussion of application numbers in DOCDB over time and over multiple authorities, see Number format concordance - application numbers at 
https://www.epo.org/searching-for-patents/helpful-resources/data/tables/regular.html.

kind

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Kind code of applications comes from DOCDB. Values include:

A=Patent
U=Utility
P=Provisional application
W=PCT
F=Design
T=Translation

Note that some documents (utility models, reissued patents, etc.) contain non-standard kind codes used by various patent-granting authorities. See the Kind Code Concordance List for a list of many of the kind codes corresponding to the different publication stages of a patent application.

date

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Date of filing (YYYYMMDD)
Note: If no date is present and a document-id element exists, a default value of 00010101 (which may appear as 10101) or 19000101 is inserted. The 00010101 date is available in Solr responses only and is not present in the XML.

lang

Original language of filing, 2-character code based on ISO 639-2.
Note: The default value is "XX" if no language information is provided by the data source.