1. Added summaries of several RFC standards on URLs and URNs.
2. Added partial summaries on XML and XML Schema.

* [RFC,NEW] Hierarchy for RFC triples assertions.
* [RFC_[1630,1736,1737,1738,1808,2396,3066],NEW] Summary of RFC 1630, 1736, 1737, 1738, 1808, 2396, 3066.
* [XML,DOC] Added a partial summary of recommendation 1.0.5. This is very difficult to process. A significant attempt will be needed to sort thinks out here.
* [XML_SCHEMA,XML_SCHEMA_PRIMER,NEW] Added parial summary of XML Schema 0: Primer recommendation. Work in progress.