Multidataset

The multidataset XML (.m6mmultidataset.xml) is used to setup and describe similar type datasets. A dataset is typically produced from the same source data/format.

All entries in this file are treated as hints and may be overridden by the map renderer. Also, all "limits" refer to selected scalebase (nominal or actual) multiplied by nominalscalefactor. For "nominal", these do not usually match actual map scale.

All limits can be given as zoomlevels since Maria GDK 2.0. Use postfix "L" to parse limits as zoomlevel instead ofmapscale(f.ex. minvisible="15L" maxvisible="6L"). Mapscales will be converted to corresponding zoomlevels. Thinningtab and scalebase isobsolete since version 2.0.

Multidataset

Example:

<multidataset>
  <globalsettings>
    <multidatasetlimits minvisible="1K" maxvisible="1000000K" 
                        simplestyle="10000K" label="10M"/>
    <resourcereferences styleroot="m6msymbols" 
                        symbols="n5000\symbols.xml" 
                        normal="n5000\ScriptCollection.xml" 
                        simple="n5000\ScriptCollection.xml" 
                        featuregrouping="n5000\featuregrouping.xml"/>
    <groupsetting drawpri="300">
      <limits minvisible="1K" maxvisible="100000K" 
              simplestyle="10000K" label="10M"/>
    </groupsetting>
  </globalsettings>

  <groupsettingtemplates>
    <groupsettingtemplate grouppattern="Arealdekke" geotype="area">
      <groupsetting  drawpri="700" thinning="1.0">
        <limits maxvisible="10M"/>
      </groupsetting>
    </groupsettingtemplate> 

    <groupsettingtemplate grouppattern="Arealdekke" geotype="line">
      <groupsetting  drawpri="400" thinning="1.0">
        <limits maxvisible="10M"/>
      </groupsetting>
    </groupsettingtemplate> 

    <groupsettingtemplate grouppattern="Roads\Motorvei" geotype="line">
      <groupsetting  drawpri="290" thinning="1.0">
        <limits maxvisible="10M"/>
      </groupsetting>
    </groupsettingtemplate>

    <groupsettingtemplate grouppattern="Buildings" geotype="line">
      <groupsetting  drawpri="150" thinning="1.0">
        <limits maxvisible="10M"/>
      </groupsetting>
    </groupsettingtemplate> 

    <groupsettingtemplate grouppattern="Navn" geotype="point">
      <groupsetting drawpri="50" thinning="1.0">
        <limits maxvisible="10M" />
      </groupsetting>
    </groupsettingtemplate>
  </groupsettingtemplates>  

  <add filepattern="N5000.m6mindex"/>
</multidataset>

<multidataset> is the root node of the multidataset-xml.

Child element	Description	Properties
	Global settings for multidataset.	C
	Feature thinning table. Obsolete since Maria GDK 2.0.	O C
	Templates for group settings.	O R C
	Filters used to add data files.	O R A

Globalsettings

Child element	Description	Properties
multidatasetlimits	Collection of scale limits that apply globally to this multidataset.	O A
scalebase	Global map scale base. Obsolete since Maria GDK 2.0	O A
nominalscalefactor	Global scale factor.	O A
cache	Global map cache settings.	O C
groupsetting	Default groupsettings.	O C A
resourcereferences	Collection of style information hints to be used by the map renderer.	A
datasetclipborder	Dataset clip border setting. Used to prevent clipping of large point symbols at dataset borders.	O A

Multidatasetlimits

Scale/level limits that apply gobally to this multidataset. See #limits for further information. Also used for setting overzoom parameter.

Overzoom is used for drawing maps on levels where no data exists. The number of levels specified by the overzoom parameter controls the number of levels the mapservice can search upwards in the maplevel tree for data to draw. The first level encountered to contain data will be used.

Note: overzoom is implemented post version 2.0.1.

Attribute	Description	Properties
overzoom	Number of levels. Default value is 0.	\

Example:

<multidatasetlimits minvisible="0" maxvisible="256M" simplestyle="256M" label="10M" overzoom="4"/>

Groupsetting

Groupsettings under globalsettings act as a default template for the groupsettings listed in the groupsettingtemplate section of the xml.

Child element	Description	Properties
	Collection of scale limits that apply globally to this multidataset.	O A
	Layer clip border setting. Used to prevent clipping of large point symbols at tile borders.	O A

Attribute	Description	Properties
drawpri	Layer draw priority. Lower number equals higher priority. Default value is 100.
thinning	Default value is -1.0. (No thinning)

Limits

All limits refer to selected scalebase (nominal or actual) multiplied by nominalscalefactor. For nominal, these do not usually match actual map scale.

Attribute	Description	Properties
minvisible	Minimum scale for rendering layer. Use of scale factors (k/K/m/M) are allowed.
maxvisible	Maximum scale for rendering layer. Use of scale factors (k/K/m/M) are allowed.
simplestyle	Scale threshold (minimum scale) for showing simple style.
label	Scale threshold (maximum scale) for showing label.

Clipborder

Clipborder is only used when drawing points.

Attribute	Description	Properties
value	Clip border value in pixels.

Thinningtab

Thinning tabs may produce ugly artifacts and have no use for regular maps. Use with caution.

  <thinningtab active="true">
    <entry scale="1" accuracy="1.0"/>
    <entry scale="10k" accuracy="4.0"/>
    <entry scale="25k" accuracy="8.0"/>
    <entry scale="50k" accuracy="15.0"/>
    <entry scale="100k" accuracy="30.0"/>
    <entry scale="250k" accuracy="150.0"/>
    <entry scale="500k" accuracy="300.0"/>
    <entry scale="1M" accuracy="600.0"/>
    <entry scale="5M" accuracy="3000.0"/>
  </thinningtab>

Child element	Description	Properties
	Thinning table entry.	A R

Attribute	Description	Properties
active	True if thinning table values should be used. Default value is false/inactive.

Entry

Attribute	Description	Properties
scale	Map scale threshold.
accuracy	Thinning accuracy value.

Groupsettingtemplates

Child element	Description	Properties
	Feature group settings template entry.	R C A

Groupsettingtemplate

Child element	Description	Properties
	Featuregroup settings.	C A

Attribute	Description	Properties
grouppattern	Featuregroup namepattern filter.
geotype	Geotype in featuregroup. Valid values are point, line, area and unknown. Default value is unknown.

Groupsetting

See paragraph Groupsetting. Values in this groupsetting block overrides the values in the global groupsetting block.

Add

Attribute	Description	Properties
filepattern	Filepattern filter. Used to select map data files (mainly .vtiles.sqlite).	R