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License: BSD 3-Clause "New" or "Revised" License
The maxOccurs
attribute is omitted from the definition of ebuttm:documentIntendedTargetFormat
, and it defaults to 1, so if a document wants to signal intended conformance to multiple target formats, this is prohibited. Suggest adding maxOccurs="unbounded"
.
ebutt_d.xsd specifies http://www.w3.org/ns/ttml
as the target namespace, conflicting with the TTML1 XSD -- specifically ttaf1-dfxp-document.xsd, which also defines the same target namespace.
For each merge request there is a review time for 10 working days (working days: Mo-Fr). If there no blocking comment it can be merged. Otherwise it needs to be resolved. If for some reason a resolution of a blocking comment is not feasible, a decision is made by the EBU Timed Text working group.
The way that EBU-TT metadata is handled at the moment has some issues:
I suggest we remove the metadata from the EBU-TT-D XSD and create a new XSD for EBU-TT Metadata specifically.
A note should say, that all document vocabulary that is not defined in TTML1 or EBU-TT-D needs to be pruned before validation. Otherwise the new XSD may generate "false negative" i.e. it could produce an error for a document that conforms to TTML1.
In TTML1, <style>
cannot contain <metadata>
, but the EBU-TT-D XSD allows it:
Line 86 in d7dc05b
The following change needs to be reflected in the EBU-TT-D XSD for version 1.0.1.
This feature and attribute was not present.
The attribute was added to the tt:tt element.
The following change needs to be reflected in the EBU-TT-D-XSD
This feature and attribute was not present.
The attributes was added to the tt:style element.
See also ebu/ebu-tt-m-xsd#30.
Found during the live toolkit implementation:
[0]*[1-9][0-9]*\s[0]*[1-9][0-9]*
Seems to be a better representation
When validating ebutt_d.xsd
using Oxygen the following error is given:
The namespace attribute, 'http://www.w3.org/ns/ttml#styling', of an element information item must be identical to the targetNamespace attribute, 'urn:ebu:tt:style', of the imported document.
Changing line 8 to <xs:import namespace="urn:ebu:tt:style" schemaLocation="styling.xsd"/>
solved the issue but I would like confirmation that this is the correct solution.
The distributionMediaTimingType currently does not allow the specification of fractions of a second with less than three digits (e.g. 00:00:00.12 would not be allowed). But the EBU-TT-D spec does not specify this restriction.
The following change needs to be reflecred in the EBU-TT-D XSD for version 1.0.1
The TTML 1 metadata attributes ttm:agent and ttm:role were allowed on tt:body, tt:p and tt:span.
TTML 1 metadata attributes can be used as defined in TTML 1.
The URI for the schema location of the xml.xsd in ebutt_d.xsd has a leading space. Although the data type of the schema location attribute is xs:anyUri and spaces are allowed for that type, their use is discouraged and may also result in problems for schema validating processors.
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