# Extract Strings (1 per object) ### Description Extracts string values from an object for a specific property. For example, it can be used to extract the title from a document, or the name of a person. The property should be provided as a parameter. With additional blocks, the extracted values can be transformed or used in a retrieval model. This variant extracts exactly 1 string per object: - If an object has more than 1 string for a given property, the "best" one is chosen - If an object has no string for a given property, a default value is used ### Input - `SOURCE [OBJ]`: a list of objects ### Output - `PAIR [OBJ,STRING]`: for each object in the input source the extracted string value is provided as the second column in `[OBJ,STRING]`. When multiple values can be extracted for an object, each object-value pair is returned as a separate result. - `RESULT [STRING]`: the extracted values, disjoint from their parent object. Use the score aggregation parameter to define how occurrences of the same value are handled. ### Parameters - `Property`: the property to extract the values from. Use `*` to extract values from all properties - `Use sub-properties`: when set to `true`, the values of all sub properties are also included. Sub-properties can be defined in the data with the `rdfs:subPropertyOf` relation. - `Language`: when a language is selected, only the strings in this language are extracted. This uses the language tags that are defined in the data. - `DefaultString`: when an object has no value for the given property, use this string.