Data Catalog API methods that are related to Data Catalog search and metadata are deprecated and will be discontinued on January 30, 2026. SeeTransition from Data Catalog to Dataplex Universal Catalog. Methods that are related to policy tags and policy tag taxonomies are not deprecated.
Represents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression language. The syntax and semantics of CEL are documented athttps://github.com/google/cel-spec.
Example (Comparison):
title: "Summary size limit"
description: "Determines if a summary is less than 100 chars"
expression: "document.summary.size() < 100"
Example (Equality):
title: "Requestor is owner"
description: "Determines if requestor is the document owner"
expression: "document.owner == request.auth.claims.email"
Example (Logic):
title: "Public documents"
description: "Determine whether the document should be publicly visible"
expression: "document.type != 'private' && document.type != 'internal'"
Example (Data Manipulation):
title: "Notification string"
description: "Create a notification string with a timestamp."
expression: "'New message received at ' + string(document.create_time)"
The exact variables and functions that may be referenced within an expression are determined by the service that evaluates it. See the service documentation for additional information.
Fields
expression
string
Textual representation of an expression in Common Expression Language syntax.
title
string
Optional. Title for the expression, i.e. a short string describing its purpose. This can be used e.g. in UIs which allow to enter the expression.
description
string
Optional. Description of the expression. This is a longer text which describes the expression, e.g. when hovered over it in a UI.
location
string
Optional. String indicating the location of the expression for error reporting, e.g. a file name and a position in the file.
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Hard to understand","hardToUnderstand","thumb-down"],["Incorrect information or sample code","incorrectInformationOrSampleCode","thumb-down"],["Missing the information/samples I need","missingTheInformationSamplesINeed","thumb-down"],["Other","otherDown","thumb-down"]],["Last updated 2025-07-17 UTC."],[[["\u003cp\u003eExpr is a message type representing a textual expression in Common Expression Language (CEL) syntax, which is documented externally.\u003c/p\u003e\n"],["\u003cp\u003eCEL expressions can be used for comparisons, equality checks, logical operations, and data manipulation within various service contexts.\u003c/p\u003e\n"],["\u003cp\u003eEach Expr message includes an \u003ccode\u003eexpression\u003c/code\u003e field for the CEL code, along with optional fields like \u003ccode\u003etitle\u003c/code\u003e, \u003ccode\u003edescription\u003c/code\u003e, and \u003ccode\u003elocation\u003c/code\u003e to provide context and metadata.\u003c/p\u003e\n"],["\u003cp\u003eThe exact variables and functions available in a CEL expression are defined by the specific service that evaluates it.\u003c/p\u003e\n"]]],[],null,["# Package google.type\n\nIndex\n-----\n\n- [Expr](/data-catalog/docs/reference/rpc/google.type#google.type.Expr) (message)\n\nExpr\n----\n\nRepresents a textual expression in the Common Expression Language (CEL) syntax. CEL is a C-like expression language. The syntax and semantics of CEL are documented at \u003chttps://github.com/google/cel-spec\u003e.\n\nExample (Comparison): \n\n title: \"Summary size limit\"\n description: \"Determines if a summary is less than 100 chars\"\n expression: \"document.summary.size() \u003c 100\"\n\nExample (Equality): \n\n title: \"Requestor is owner\"\n description: \"Determines if requestor is the document owner\"\n expression: \"document.owner == request.auth.claims.email\"\n\nExample (Logic): \n\n title: \"Public documents\"\n description: \"Determine whether the document should be publicly visible\"\n expression: \"document.type != 'private' && document.type != 'internal'\"\n\nExample (Data Manipulation): \n\n title: \"Notification string\"\n description: \"Create a notification string with a timestamp.\"\n expression: \"'New message received at ' + string(document.create_time)\"\n\nThe exact variables and functions that may be referenced within an expression are determined by the service that evaluates it. See the service documentation for additional information."]]
