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Metadata Field
A metadata field is either:
Simple: which means it has a scalar value, for example a string, long or boolean
Complex: which means the value consists of a list of other fields termed sub fields.
The types SimpleField and ComplexField are each further specialised into additional types.
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Base Class
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Sub Class #1
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Sub Class #2
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Comment
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Examples
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SimpleField
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Contains a string value with less than 32K characters.
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Title
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SimpleField
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BooleanField
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Contains a boolean value. In MediaHaven 1.0 web site and the old External Metadata [deprecated] this shown as either "0" or "1".
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IsFragment, ContainsGeoData
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SimpleField
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EnumField
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Contains a string value. The value is limited to a specific set of values defined on the fielddefinition
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SimpleField
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TimeCodeField
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Contains a timecode in ISO timecode format, e.g. "00:25:12.840"
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StartTimeCode
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SimpleField
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LongField
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Contains a long value, e.g. "5845988"
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Width, Height, FileSize
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SimpleField
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LongField
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FramesField
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Contains a long value with up 10 zeroes prepadded, e.g. "0000000025"
The rationale is to make it lexicographically sortable in Lucene, because regular long values are not.
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FragmentStartFrames
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SimpleField
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DateField
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Contains a full ISO8601 date in microsecond precision and Zulu time. The machine specification of the format is yyyy-MM-dd'T'HH:mm:ss.SSSSSS'Z'
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1925-11-30T15:23:48.123456Z
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SimpleField
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TextField
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Contains a string value of any length or when the value is tokenized
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Description
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ComplexField
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Contains as value a list of metadata fields
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Browses
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ComplexField
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MultiItemField
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Contains as value a list of simple fields.
The string value of sub fields are trimmed and empty values are ignored
The sub fields have no order
The sub fields can be duplicate on their key, but their value must differ (case insensitive)
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Authors
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ComplexField
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MultiItemField
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ListField
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ListFieldis a specializedMultiItemFieldwhere all sub fields must have the same (predefined) keyThis allows for representing the value as a list
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Keywords, Categories, Publications
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ComplexField
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MultiItemField
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MapField
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MapFieldis a specializedMultiItemFieldwhere all sub fields have a unique key.This allows for representing the value as a (hash) map
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