=== ''PARA''
:::syntax
__Paragraph__ **=** ''(PARA'' [[__InlineElement__|00001012931600]] … '')''.
:::
A paragraph is just a list of inline elements.

=== ''HEADING''
:::syntax
__Heading__ **=** ''(HEADING'' Number [[__Attributes__|00001012931000#attribute]] String,,1,, String,,2,, [[__InlineElement__|00001012931600]] … '')''.
:::
A heading consists of a number, which specifies its level (1 -- 5), its optional attributes.
The first string is a ""slug"" of the heading text, i.e. transformed it to lower case, replaced space character with minus sign, and some more.
The second string is the slug, but made unique for the whole zettel.
Then the heading text follows as a sequence of inline elements.

=== ''THEMATIC''
:::syntax
__Thematic__ **=** ''(THEMATIC'' [[__Attributes__|00001012931000#attribute]] '')''.
:::

=== ''ORDERED'', ''UNORDERED'', ''QUOTATION''
These three symbols are specifying different kinds of lists / enumerations: an ordered list, an unordered list, and a quotation list.
Their structure is the same.

:::syntax
__OrderedList__ **=** ''(ORDERED'' [[__Attributes__|00001012931000#attribute]] ListItem … '')''.

__UnorderedList__ **=** ''(UNORDERED'' [[__Attributes__|00001012931000#attribute]] ListItem … '')''.

__QuotationList__ **=** ''(QUOTATION'' [[__Attributes__|00001012931000#attribute]] ListItem … '')''.
:::
where
:::syntax
__ListItem__ **=** ''(BLOCK'' ItemElement … '')''.

__ItemElement__ **=** __OrderedList__ **|** __UnorderedList__ **|** __QuotationList__ **|** __Paragraph__.
:::

Please note that the elements of the various lists begin with a BLOCK symbol, but they themselves may contain only (nested) lists and paragraphs.
Other block elements are not permitted.

=== ''DESCRIPTION''
:::syntax
__Description__ **=** ''(DESCRIPTION'' [[__Attributes__|00001012931000#attribute]] __DescriptionTerm__ __DescriptionValues__ __DescriptionTerm__ __DescriptionValues__ … '')''.
:::
A description is a sequence of one or more terms and values.

:::syntax
__DescriptionTerm__ **=** ''('' [[__InlineElement__|00001012931600]] … '')''.
:::
A description term is just an inline-structured value.

:::syntax
__DescriptionValues__ **=** ''(BLOCK'' [[__Block__|00001012931000#block]] … '')''.
:::
where
:::syntax
__DescriptionBlock__ **=** ''(BLOCK'' Paragraph … '')''.
:::
Description values are sequences of blocks that contain only paragraphs.
From this restriction it follows that, within a description, only inline elements are allowed. Nested block elements are not allowed.

=== ''TABLE''
:::syntax
__Table__ **=** ''(TABLE'' [[__Attributes__|00001012931000#attribute]] __TableHeader__ __TableRow__ … '')''.
:::
A table is a table header and a sequence of table rows.

:::syntax
__TableHeader__ **=** ''()'' **|** ''('' __TableCell__ … '')''.
:::
A table header is either the empty list or a list of table cells.

:::syntax
__TableRow__ **=** ''('' __TableCell__ … '')''.
:::
A table row is a list of table cells.

=== ''CELL''
:::syntax
__TableCell__ **=** ''(CELL'' [[__Attributes__|00001012931000#attribute]] [[__InlineElement__|00001012931600]] … '')''.
:::
A table cell contains some attributes and cell content, which is a sequence of inline elements.

The attribute ''align'' specifies the cell alignment.
An attribute value ''"center"'' specifies centered aligned cell content.
The attribute value ''"left"'' specifies left aligned cell content.
The attribute value ''"right"'' specifies right aligned cell content.
In all other cases, a default alignment is assumed.

=== ''REGION-*''
The following lists specify different kinds of regions.
A region treat a sequence of block elements to be belonging together in certain ways.
They have a similar structure.

:::syntax
__BlockRegion__ **=** ''(REGION-BLOCK'' [[__Attributes__|00001012931000#attribute]] ''('' [[__BlockElement__|00001012931400]] … '')'' [[__InlineElement__|00001012931600]] … '')''.
:::
A block region just treats the block to belong in an unspecified way.
Typically, the reason is given in the attributes.
The inline describes the block.

:::syntax
__QuoteRegion__ **=** ''(REGION-QUOTE'' [[__Attributes__|00001012931000#attribute]] ''('' [[__BlockElement__|00001012931400]] … '')'' [[__InlineElement__|00001012931600]] … '')''.
:::
A block region just treats the block to contain a longer quotation.
Attributes may further specify the quotation.
The inline typically describes author / source of the quotation.

:::syntax
__VerseRegion__ **=** ''(REGION-VERSE'' [[__Attributes__|00001012931000#attribute]] ''('' [[__BlockElement__|00001012931400]] … '')'' [[__InlineElement__|00001012931600]] … '')''.
:::
A block region just treats the block to contain a verse.
Soft line breaks are transformed into hard line breaks to save the structure of the verse / poem.
Attributes may further specify something.
The inline typically describes author / source of the verse.

=== ''VERBATIM-*''
The following lists specifies some literal text of more than one line.
The structure is always the same, the initial symbol denotes the actual usage.
The content is encoded as a string, most likely to contain control characters that signals the end of a line.

:::syntax
__CommentVerbatim__ **=** ''(VERBATIM-COMMENT'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains text that should be treated as an internal comment not to be interpreted further.

:::syntax
__EvalVerbatim__ **=** ''(VERBATIM-EVAL'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains text that should be evaluated by an (external) software to produce some derived content.

:::syntax
__HTMLVerbatim__ **=** ''(VERBATIM-HTML'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains HTML code.

:::syntax
__MathVerbatim__ **=** ''(VERBATIM-MATH'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains text that should be treated as special code to be interpreted as mathematical formulas.

:::syntax
__CodeVerbatim__ **=** ''(VERBATIM-CODE'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains text that should be treated as (executable) code.

:::syntax
__ZettelVerbatim__ **=** ''(VERBATIM-ZETTEL'' [[__Attributes__|00001012931000#attribute]] String '')''.
:::
The string contains text that should be treated as (nested) zettel content.

=== ''BLOB''
:::syntax
__BLOB__ **=** ''(BLOB'' [[__Attributes__|00001012931000#attribute]] String,,1,, String,,2,, [[__InlineElement__|00001012931600]] … '')''.
:::
A BLOB contains an image in block mode.
The inline elements states some description.
The first string contains the syntax of the image.
The second string contains the actual image.
If the syntax is ""''svg''"", then the second string contains the SVG code.
Otherwise the (binary) image data is encoded with base64.

=== ''TRANSCLUDE''
:::syntax
__Transclude__ **=** ''(TRANSCLUDE'' [[__Attributes__|00001012931000#attribute]] [[__Reference__|00001012931900]] [[__InlineElement__|00001012931600]] … '')''.
:::
A transclude list only occurs for a parsed zettel, but not for a evaluated zettel.
Evaluating a zettel also means that all transclusions are resolved.

__Reference__ denotes the zettel to be transcluded.