# Data Collection Entities When working with the Lab Logic Toolkit *evaluateDynamicExpression* script, custom field values can originate from the following data collection entities (these will differ, depending on the step from which the script is being run): * input (analyte/derived sample) * output (analyte/derived sample or per-input result file, measurement, or file placeholder)¹ * step * container * submittedSample / submittedSamples² ¹ Shared and per-reagent-label result files / measurements (e.g., those produced by a demultiplexing step) are not supported. ² Use 'submittedSamples' with pooled derived samples, and 'submittedSample' for single-source derived samples. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://help.claritylims.illumina.com/integration-toolkits/lltk/lltk-working-with-the-script/lltk-data-collection-entities.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.