<!-- History
20050517 TA split from RIPCIS
20080605 TA comments added
20080625 PF comments validation and clean-up
concordance/@classifying-level: Prereform is not covered "Core" should be used for prereform concordance files
-->
<!-- Contacts: WIPO: (patrick.fievet@wipo.int).-->
<!-- rcl (root): RCL (stands for reverse concordance list). Lists connections between IPC entries in from-edition to IPC entries in "to-edition", on the level designated by classifying level
Specification of the RCL content, and possible values is available in WIPO official web site for International Patent Classification : IPCR_RCL file specs_v1.0.doc)
-->
<!ELEMENT rcl (concordance+)>

<!ATTLIST rcl
	from-version	CDATA	#REQUIRED
	classifying-level (Core|Advanced)	#REQUIRED
	to-version	CDATA	#REQUIRED
>

<!ELEMENT concordance (concordance-to+)>
<!ATTLIST concordance
	from-symbol	CDATA	#REQUIRED
	modification	(c|d|s)	#REQUIRED
>

<!ELEMENT concordance-to EMPTY>
<!ATTLIST concordance-to
	to-symbol	CDATA	#REQUIRED
	modification	(c|n|t)	#REQUIRED
>