- 
inclusion
- 
Warn about inclusions in element type declarations.
- 
exclusion
- 
Warn about exclusions in element type declarations.
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rcdata-content
- 
Warn about RCDATA declared content in element type declarations.
- 
cdata-content
- 
Warn about CDATA declared content in element type declarations.
- 
ps-comment
- 
Warn about comments in parameter separators.
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attlist-group-decl
- 
Warn about name groups in attribute declarations.
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element-group-decl
- 
Warn about name groups in element type declarations.
- 
pi-entity
- 
Warn about PI entities. 
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internal-sdata-entity
- 
Warn about internal SDATA entities.
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internal-cdata-entity
- 
Warn about internal CDATA entities.
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external-sdata-entity
- 
Warn about external SDATA entities.
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external-cdata-entity
- 
Warn about external CDATA entities.
- 
bracket-entity
- 
Warn about bracketed text entities.
- 
data-atts
- 
Warn about attribute definition list declarations for notations.
- 
missing-system-id
- 
Warn about external identifiers without system identifiers.
- 
conref
- 
Warn about content reference attributes.
- 
current
- 
Warn about current attributes.
- 
nutoken-decl-value
- 
Warn about attributes with a declared value of NUTOKEN or NUTOKENS.
- 
number-decl-value
- 
Warn about attributes with a declared value of NUMBER or NUMBERS.
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name-decl-value
- 
Warn about attributes with a declared value of NAME or NAMES.
- 
named-char-ref
- 
Warn about named character references.
- 
refc
- 
Warn about ommitted refc delimiters. 
- 
temp-ms
- 
Warn about TEMP marked sections.
- 
rcdata-ms
- 
Warn about RCDATA marked sections.
- 
instance-include-ms
- 
Warn about INCLUDE marked sections in the document instance.
- 
instance-ignore-ms
- 
Warn about IGNORE marked sections in the document instance.
- 
and-group
- 
Warn about AND connectors in model groups.
- 
rank
- 
Warn about ranked elements.
- 
empty-comment-decl
- 
Warn about empty comment declarations.
- 
att-value-not-literal
- 
Warn about attribute values which are not literals.
- 
missing-att-name
- 
Warn about ommitted attribute names in start tags.
- 
comment-decl-s
- 
Warn about spaces before the MDC in comment declarations.
- 
comment-decl-multiple
- 
Warn about comment declarations containing multiple comments.
- 
missing-status-keyword
- 
Warn about marked sections without a status keyword.
- 
multiple-status-keyword
- 
Warn about marked sections with multiple status keywords.
- 
instance-param-entity
- 
Warn about parameter entities in the document instance.
- 
min-param
- 
Warn about minimization parameters in element type declarations. 
- 
mixed-content-xml
- 
Warn about cases of mixed content which are not allowed in XML.
- 
name-group-not-or
- 
Warn about name groups with a connector different from OR.
- 
pi-missing-name
- 
Warn about processing instructions which don't start with a name.
- 
instance-status-keyword-s
- 
Warn about spaces between DSO and status keyword in marked sections.
- 
external-data-entity-ref
- 
Warn about references to external data entities in the content.
- 
att-value-external-entity-ref
- 
Warn about references to external data entities in attribute values.
- 
data-delim
- 
Warn about occurances of `<' and `&' as data.
- 
explicit-sgml-decl
- 
Warn about an explicit SGML declaration. 
- 
internal-subset-ms
- 
Warn about marked sections in the internal subset.
- 
default-entity
- 
Warn about a default entity declaration.
- 
non-sgml-char-ref
- 
Warn about numeric character references to non-SGML characters.
- 
internal-subset-ps-param-entity
- 
Warn about parameter entity references in parameter separators in the 
internal subset.
- 
internal-subset-ts-param-entity
- 
Warn about parameter entity references in token separators in the 
internal subset.
- 
internal-subset-literal-param-entity
- 
Warn about parameter entity references in parameter literals in the 
internal subset.