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‎Samples.xcodeproj/project.pbxproj‎

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‎Shared/Samples/Query with CQL filters/QueryWithCQLFiltersView.swift‎

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// Copyright 2024 Esri
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// https://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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import ArcGIS
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import SwiftUI
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struct QueryWithCQLFiltersView: View {
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@State private var map = Map(basemapStyle: .arcGISTopographic)
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var body: some View {
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MapView(map: map)
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}
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}
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#Preview {
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QueryWithCQLFiltersView()
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}

‎Shared/Samples/Query with CQL filters/README.md‎

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# Query with CQL filters
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Query data from an OGC API feature service using CQL filters.
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![Image of Query with CQL filters](QueryWithCqlFilters.jpg)
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## Use case
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CQL (Common Query Language) is an OGC-created query language used to query for subsets of features. Use CQL filters to narrow geometry results from an OGC feature table.
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## How to use the sample
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Enter a CQL query. Press the "Apply query" button to see the query applied to the OGC API features shown on the map.
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## How it works
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1. Create an `OgcFeatureCollectionTable` object using a URL to an OGC API feature service and a collection ID.
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2. Create a `QueryParameters` object.
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3. Set the `QueryParameters.WhereClause` property.
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4. Set the `QueryParameters.MaxFeatures` property.
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5. Create `Datetime` objects for the start time and end time being queried.
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6. Create a `TimeExtent` object using the start and end `Datetime` objects. Set the `QueryParameters.TimeExtent` property
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7. Populate the `OgcFeatureCollectionTable` using `PopulateFromServiceAsync()` with the custom `QueryParameters` created in the previous steps.
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8. Use `MapView.SetViewpointGeometryAsync()` with the `OgcFeatureCollectionTable.Extent` to view the newly-queried features.
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## Relevant API
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* OGCFeatureCollectionTable
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* QueryParameters
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* TimeExtent
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## About the data
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The [Daraa, Syria test data](https://demo.ldproxy.net/daraa) is OpenStreetMap data converted to the Topographic Data Store schema of NGA.
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## Additional information
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See the [OGC API website](https://ogcapi.ogc.org/) for more information on the OGC API family of standards. See the [CQL documentation](https://portal.ogc.org/files/96288#cql-core) to learn more about the common query language.
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## Tags
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browse, catalog, common query language, CQL, feature table, filter, OGC, OGC API, query, service, web

‎Shared/Samples/Query with CQL filters/README.metadata.json‎

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{
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"category": "Search and Query",
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"description": "Query data from an OGC API feature service using CQL filters.",
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"ignore": false,
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"images": [],
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"keywords": [
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"CQL",
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"OGC",
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"OGC API",
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"browse",
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"catalog",
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"common query language",
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"feature table",
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"filter",
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"query",
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"service",
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"web",
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"OGCFeatureCollectionTable",
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"QueryParameters",
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"TimeExtent"
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],
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"redirect_from": [],
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"relevant_apis": [
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"OGCFeatureCollectionTable",
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"QueryParameters",
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"TimeExtent"
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],
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"snippets": [
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"QueryWithCQLFiltersView.swift"
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],
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"title": "Query with CQL filters"
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}

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