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EPUBCheck is a tool to validate the conformance of EPUB publications against the EPUB specifications. EPUBCheck can be run as a standalone command-line tool or used as a Java library.

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# #####################################################################
##  RELAX NG Schema for HTML 5: Advanced Embedded Content             #
# #####################################################################

## Attributes Common to Media Elements

	# src not included
	media.attrs = 
		(	media.attrs.autoplay?
		&	media.attrs.preload?
		&	media.attrs.controls?
		&	media.attrs.loop?
		&	media.attrs.muted?
		&	embedded.content.attrs.crossorigin?
		)
		media.attrs.autoplay   =
			attribute autoplay   {
				 "autoplay" |  ""
			}
		media.attrs.preload   =
			attribute preload   {
				 "none" |  "metadata" |  "auto" |  ""
			}
		media.attrs.controls  =
			attribute controls  {
				 "controls" |  ""
			}
		media.attrs.loop =
			attribute loop {
				 "loop" |  ""
			}
		media.attrs.muted =
			attribute muted {
				 "muted" |  ""
			}
		
## Source: 

	source.elem =
		element source { source.inner & source.attrs }
	source.attrs =
		(	common.attrs
		&	source.attrs.src
		&	source.attrs.type?
		)
		source.attrs.src =
			attribute src {
				common.data.uri.non-empty
			}
		source.attrs.type =
			attribute type {
				common.data.mimetype
			}
	source.inner =
		( empty )

## Media Source

	media.source = 
		(	media.attrs.src
		|	source.elem*
		)

	media.attrs.src =
		attribute src {
			common.data.uri.non-empty
		}

## Video: 

	figure.elem =
		element figure { figure.inner & figure.attrs }
	figure.attrs =
		(	common.attrs
		&	(	common.attrs.aria.implicit.figure
			|	common.attrs.aria?
			)?
		)
	figure.inner =
		(	( figcaption.elem?, common.inner.flow )
		|	( common.inner.flow, figcaption.elem? )
		)

	common.elem.flow |= figure.elem

## Figure caption: 

	figcaption.elem =
		element figcaption { figcaption.inner & figcaption.attrs }
	figcaption.attrs =
		(	common.attrs
		&	(	common.attrs.aria.role.presentation
			|	common.attrs.aria.role.group
			)?
		)
	figcaption.inner =
		( common.inner.flow )