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A condition must be specified according to:

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  columnId columnId

  columnId is a reference to a column in the forecast table (see below), usually a parameter,

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  rowId rowId

  rowId is a reference to a row in the forecast table (see below), usually a location,

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  ifForecastValue ifForecastValue

  ifForecastValue indicates a condition based on the value of the published forecast,

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  ifForecastPublicationTime ifForecastPublicationTime

  ifForecastPublicationTime indicates a condition based on the publication time of the forecast,

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  ifForecastPublished ifForecastPublished

  ifForecastPublished indicates a condition based on whether a forecast has been published or not,

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  operator operator

  operator is one of "lt" (less than), "gt" (greater than), "le" (less than or equal to), "ge" (greater than or equal to), "eq" (equal to), "ne" (not equal to), "before", or "after", depending on the type of condition,
• value is the reference value to compare to; depending on the condition type, this can be an integer/real value, a boolean value, or a date/time value.

shown on the right.

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  unit unit

  unit: a string containing the unit for the column (e.g. "cm" for a water level), which will also appear in the header of the column,

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  type type

  type: one of "string", "integer", "float", "boolean", or "dateTime", which indicates the type of data that is displayed in the column,

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  isEditable isEditable

  isEditable: a flag with value true or false indicating whether the column is editable for the user (e.g. the user can enter the forecast in this column),

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  isExport isExport

  isExport: a flag with value true or false indicating whether the column must be exported to file if the forecast is published (editable columns are exported by default),

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  exportName exportName

  exportName: a string containing the name that must be used for exporting the column to file,

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  lang lang

  lang: a string that specifies the language of the header; this attribute behaves the same as for the title keys.

For example, the header section in the forecast table may look like:

<header>
   <column id="station">station</column>
   <column id="date">date</column>
   <column id="time">time</column>
   <column id="astro_level" unit="cm">astronomical water level</column>
   <column id="water_level" isEditable="true" unit="cm">water level</column>
   <column id="evacuate" isEditable="true" type="boolean">evacuate?</column>
</header>

Rows can be added to the forecast table by specifying the row key. The number of rows is arbitrary. For each row, an identifier must be specified using the id attribute. Content for a row is added using the cell key, where each cell must correspond to a column in the header. This can be achieved with the columnId attribute of the row key. For example:

<row id="Vlissingen">
   <cell columnId="station">Vlissingen</cell>
   <cell columnId="date">12 Mar</cell>
   <cell columnId="time">17h16</cell>
   <cell columnId="astro_level">237</cell>
</row>

The cell key also supports a lang attribute that behaves the same as for the title keys.

shown on the right.