Synchronization of geospatial datasets and their metadata is a key point of today's SDI. In this presentation we’ll explore some use cases where metadata and the described resources interacts. Analyzing the resources, which could be webservices or datasets, could improve both end-user experience (eg. by improving search) and GIS data manager work (eg. by making metadata editing easier). Harvesting OGC services, analyzing datasources for better metadata, metadata crawling, indexing the data to improve search experience are some of the topics covered. Those examples are based on OGC map servers, Talend ETL, GeoNetwork metadata catalog with Lucene and Tika libraries.