Hemiptera plant. Phloem sap, which has a higher concentration of sugars and nitrogen, is under positive pressure unlike the more dilute xylem sap. Most of the Sternorrhyncha and a number of Auchenorrhynchan groups feed on phloem. Phloem feeding is common in the Fulgoromorpha, most Cicadellidae and in the Heteroptera. The Typhlocybine Cicadellids specialize in feeding on non-vascular mesophyll tissue of leaves, which is more nutritious than the leaf epidermis. Most Heteroptera also feed on mesophyll tissue where they are more likely to encounter defensive secondary plant metabolites which often leads to the evolution of host specificity. Obligate xylem feeding is a
SAP Business Connector version independently: SAP (who had acquired the full core Integration Server source code) started developing SAP BC 4.7, while webMethods began work on wM IS 6.0. Of course the component that changed most in SAP BC 4.7 was the "SAP Adapter", which got enhanced IDoc processing capabilities and performance improvements in the RFC communication layer. However, SAP also enhanced selected components of the core Integration Server, e.g. the job scheduler, the "Reverse Invoke" feature and the WmPartners package, which was completely redesigned. SAP tried to do these core enhancements in a backward compatible way, the only exception being the WmPartners