Database.com Metadata API Developer's Guide - Salesforce.com

Metadata TypesCustomFieldField NamerequiredscalestartingNumberstripMarkupsummarizedFieldsummaryFilterItemssummaryForeignKeysummaryOperationtrackFeedHistorytrackHistorytrackTrendingField TypebooleanintintbooleanstringFilterItem[]stringSummaryOperations(enumeration of typestring)booleanbooleanbooleanDescriptionand feel, and record ownership for junction objects. Formore information, see the Database.com Help.0 or 1 are the only valid values, and 0 is always the valuefor objects that are not junction objects.Indicates whether the field requires a value on creation(true) or not (false).The scale for the field. Scale is the number of digits to theright of the decimal point in a number. For example, thenumber 256.99 has a scale of 2.If specified, indicates the starting number for the field.Set to true to remove markup, or false to preservemarkup. Used when converting a rich text area to a longtext area.Represents the field on the detail row that is beingsummarized. This field cannot be null unless thesummaryOperation value is count.Represents the set of filter conditions for this field if it isa summary field. This field will be summed on the childif the filter conditions are met.Represents the master-detail field on the child that definesthe relationship between the parent and the child.Represents the sum operation to be performed. Valid valuesare enumerated in SummaryOperations.Indicates whether the field is enabled for feed tracking(true) or not (false). To set this field to true, theenableFeeds field on the associated CustomObject mustalso be true. For more information, see “CustomizingChatter Feed Tracking” in the Database.com Help.This field is available in API version 18.0 and later.Indicates whether history tracking is enabled for the field(true) or not (false). Also available for standard objectfields (picklist and lookup fields only) in API version 30.0and later.To set trackHistory to true, the enableHistoryfield on the associated standard or custom object must alsobe true.For more information, see “Tracking Field History” in theDatabase.com Help.Indicates whether historical trending data is captured forthe field (true) or not (false). An object is enabled forhistorical trending if this attribute is true for at least onefield. Available in API version 29.0 and later.90